Non-hemolytic LLO fusion proteins and methods of utilizing same

ABSTRACT

The present invention provides recombinant proteins or peptides comprising a mutated listeriolysin O (LLO) protein or fragment thereof, comprising a substitution or internal deletion of the cholesterol-binding domain or a portion thereof, fusion proteins or peptides comprising same, nucleotide molecules encoding same, and vaccine vectors comprising or encoding same. The present invention also provides methods of utilizing recombinant proteins, peptides, nucleotide molecules, and vaccine vectors of the present invention to induce an immune response to a peptide of interest.

GOVERNMENT INTEREST STATEMENT

This invention was made in whole or in part with government support under Grant Number R43CA108129-01 (SBIR), awarded by the National Institutes of Health. The government may have certain rights in the invention.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a Divisional of U.S. application Ser. No. 12/213,696 filed Jun. 23, 2008 which is hereby incorporated in it's entirety by reference herein.

FIELD OF INVENTION

The present invention provides recombinant proteins or peptides comprising a mutated listeriolysin O (LLO) protein or fragment thereof, comprising a substitution or internal deletion of the cholesterol-binding domain or a portion thereof, fusion proteins or peptides comprising same, nucleotide molecules encoding same, and vaccine vectors comprising or encoding same. The present invention also provides methods of utilizing recombinant proteins, peptides, nucleotide molecules, and vaccine vectors of the present invention to induce an immune response to a peptide of interest.

BACKGROUND OF THE INVENTION

Stimulation of an immune response is dependent upon the presence of antigens recognized as foreign by the host immune system. Bacterial antigens such as Salmonella enterica and Mycobacterium bovis BCG remain in the phagosome and stimulate CD4⁺ T-cells via antigen presentation through major histocompatibility class II molecules. In contrast, bacterial antigens such as Listeria monocytogenes exit the phagosome into the cytoplasm. The phagolysosomal escape of L. monocytogenes is a unique mechanism, which facilitates major histocompatibility class I antigen presentation of Listerial antigens. This escape is dependent upon the pore-forming sulfhydryl-activated cytolysin, listeriolysin O (LLO).

There exists a long-felt need to develop compositions and methods to enhance the immunogenicity of antigens, especially antigens useful in the prevention and treatment of tumors and intracellular pathogens.

SUMMARY OF THE INVENTION

The present invention provides a recombinant protein comprising a mutated listeriolysin O (LLO) protein or fragment thereof, containing a mutation in or a substitution or internal deletion of the cholesterol-binding domain, fusion proteins or peptides comprising same, nucleotide molecules encoding same, and vaccine vectors comprising or encoding same. The present invention also provides methods of utilizing recombinant proteins, peptides, nucleotide molecules, and vaccine vectors of the present invention to induce an immune response to a peptide of interest.

The present invention provides a recombinant protein comprising a listeriolysin O (LLO) protein or N-terminal fragment thereof, wherein said LLO protein or N-terminal fragment comprises a mutation in a cholesterol-binding domain (CBD), wherein said mutation comprises a substitution of a 1-50 amino acid peptide comprising a CBD as set forth in SEQ ID NO: 18 for a 1-50 amino acid non-LLO peptide, wherein said recombinant protein exhibits a greater than 100-fold reduction in hemolytic activity relative to wild-type LLO.

In another embodiment, the present invention provides a recombinant protein comprising a listeriolysin O (LLO) protein or N-terminal fragment thereof, wherein said LLO protein or N-terminal fragment comprises a mutation in a cholesterol-binding domain (CBD), wherein said mutation comprises a substitution of residue C484, W491, W492, of SEQ ID NO: 37 or a combination thereof, wherein said recombinant protein exhibits a greater than 100-fold reduction in hemolytic activity relative to wild-type LLO.

In another embodiment, the present invention provides a recombinant protein comprising (a) a listeriolysin O (LLO) protein or N-terminal fragment thereof, wherein said LLO protein or N-terminal fragment thereof comprises a 1-50 amino acid internal deletion in the cholesterol-binding domain of the LLO protein as set forth in SEQ ID NO: 18; and (b) a heterologous peptide of interest, wherein said recombinant protein exhibits a greater than 100-fold reduction in hemolytic activity relative to wild-type LLO.

In one embodiment, the mutated LLO protein or mutated N-terminal LLO protein fragment comprises a deletion of the signal peptide sequence thereof. In another embodiment, the mutated LLO protein or mutated N-terminal LLO fragment comprises the signal peptide sequence thereof. In another embodiment, the recombinant protein comprises a heterologous peptide of interest. In another embodiment, the recombinant protein comprises a non-LLO peptide, which in one embodiment, comprises said heterologous peptide of interest. In another embodiment, the heterologous peptide of interest is a full-length protein, which in one embodiment, comprises an antigenic peptide. In one embodiment, the protein is an NY-ESO-1 protein. In another embodiment, the protein is a Human Papilloma Virus (HPV) E7 protein. In another embodiment, the protein is a B-cell receptor (BCR) protein. In another embodiment, the heterologous peptide of interest is an antigenic peptide. In another embodiment, the antigenic peptide is an NY-ESO-1 peptide. In another embodiment, the antigenic peptide is a Human Papilloma Virus (HPV) E7 peptide. In another embodiment, the antigenic peptide is a B-cell receptor (BCR) peptide. In another embodiment, the antigenic peptide is a wherein said antigenic peptide is a Human Papilloma Virus (HPV)-16-E6, HPV-16-E7, HPV-18-E6, HPV-18-E7, a Her/2-neu antigen, a Prostate Specific Antigen (PSA), Prostate Stem Cell Antigen (PSCA), a Stratum Corneum Chymotryptic Enzyme (SCCE) antigen, Wilms tumor antigen 1 (WT-1), human telomerase reverse transcriptase (hTERT), Proteinase 3, Tyrosinase Related Protein 2 (TRP2), High Molecular Weight Melanoma Associated Antigen (HMW-MAA), synovial sarcoma, X (SSX)-2, carcinoembryonic antigen (CEA), MAGE-A, interleukin-13 Receptor alpha (IL13-R alpha), Carbonic anhydrase IX (CAIX), survivin, GP100, or Testisin peptide.

In another embodiment, the present invention provides a vaccine comprising the recombinant protein and an adjuvant. In another embodiment, the adjuvant comprises a granulocyte/macrophage colony-stimulating factor (GM-CSF) protein, a nucleotide molecule encoding a GM-CSF protein, saponin QS21, monophosphoryl lipid A, or an unmethylated CpG-containing oligonucleotide. In another embodiment, the present invention provides a composition comprising the recombinant protein and a heterologous peptide of interest, wherein said recombinant protein is not covalently bound to said heterologous peptide of interest. In another embodiment, the present invention provides a vaccine comprising such a composition and an adjuvant. In another embodiment, the present invention provides a recombinant vaccine vector encoding the recombinant protein. In another embodiment, the present invention provides a nucleotide molecule encoding the recombinant protein.

In another embodiment, the present invention provides a vaccine comprising the nucleotide molecule. In another embodiment, the present invention provides a recombinant Listeria strain comprising the recombinant protein or peptide. In another embodiment, the present invention provides a method for inducing an immune response in a subject, comprising administering to said subject the recombinant protein or peptide. In another embodiment, the present invention provides a method for inducing an immune response in a subject, comprising administering to said subject the composition. In another embodiment, the present invention provides a method for inducing an immune response in a subject, comprising administering to said subject the recombinant vaccine vector wherein said non-LLO protein or peptide of said recombinant protein or peptide comprises an antigenic peptide of interest, thereby inducing an immune response against said antigenic peptide of interest. In another embodiment, the present invention provides a method for inducing an immune response in a subject, comprising administering to said subject the recombinant vaccine vector that further comprises a heterologous peptide of interest, thereby inducing an immune response against said heterologous peptide of interest. In another embodiment, the present invention provides a method for inducing an immune response in a subject, comprising administering to said subject a recombinant Listeria strain wherein said non-LLO protein or peptide of said recombinant protein comprises an antigenic peptide of interest, thereby inducing an immune response against said antigenic peptide of interest. In another embodiment, the present invention provides a method for inducing an immune response in a subject, comprising administering to said subject the recombinant Listeria strain and a vector encoding a heterologous peptide of interest thereby inducing an immune response against said heterologous peptide of interest.

In another embodiment, the present invention provides a method for inducing an immune response in a subject against an NY-ESO-1-expressing cancer cell selected from an ovarian melanoma cell and a lung cancer cell, the method comprising the step of administering to said subject a recombinant protein of the present invention. In another embodiment, the present invention provides a method for treating, inhibiting, or suppressing an NY-ESO-1-expressing tumor selected from an ovarian melanoma tumor and a lung cancer tumor in a subject, the method comprising the step of administering to said subject the recombinant protein of the present invention.

In another embodiment, the present invention provides a method for inducing an immune response in a subject against an HPV E7-expressing cancer cell selected from a cervical cancer cell and a head-and-neck cancer cell, the method comprising the step of administering to said subject the recombinant protein of the present invention. In another embodiment, the present invention provides a method for treating, inhibiting, or suppressing an HPV E7-expressing tumor selected from a cervical cancer tumor and a head-and-neck cancer tumor in a subject, the method comprising the step of administering to said subject the recombinant protein of the present invention. In another embodiment, the present invention provides a method for inducing an immune response in a subject against a B-cell receptor (BCR)-expressing lymphoma, the method comprising the step of administering to said subject the recombinant protein of the present invention. In another embodiment, the present invention provides a method for treating, inhibiting, or suppressing a B-cell receptor (BCR)-expressing lymphoma in a subject, the method comprising the step of administering to said subject the recombinant protein of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1. Lm-E7 and Lm-LLO-E7 use different expression systems to express and secrete E7. Lm-E7 was generated by introducing a gene cassette into the orfZ domain of the L. monocytogenes genome (A). The hly promoter drives expression of the hly signal sequence and the first five amino acids (AA) of LLO followed by HPV-16 E7. B), Lm-LLO-E7 was generated by transforming the prfA-strain XFL-7 with the plasmid pGG-55. pGG-55 has the hly promoter driving expression of a nonhemolytic fusion of LLO-E7. pGG-55 also contains the prfA gene to select for retention of the plasmid by XFL-7 in vivo.

FIG. 2. Lm-E7 and Lm-LLO-E7 secrete E7. Lm-Gag (lane 1), Lm-E7 (lane 2), Lm-LLO-NP (lane 3), Lm-LLO-E7 (lane 4), XFL-7 (lane 5), and 10403S (lane 6) were grown overnight at 37° C. in Luria-Bertoni broth. Equivalent numbers of bacteria, as determined by OD at 600 nm absorbance, were pelleted and 18 ml of each supernatant was TCA precipitated. E7 expression was analyzed by Western blot. The blot was probed with an anti-E7 mAb, followed by HRP-conjugated anti-mouse (Amersham), then developed using ECL detection reagents.

FIG. 3. A. Tumor immunotherapeutic efficacy of LLO-E7 fusions. Tumor size in millimeters in mice is shown at 7, 14, 21, 28 and 56 days post tumor-inoculation. Naive mice: open-circles; Lm-LLO-E7: filled circles; Lm-E7: squares; Lm-Gag: open diamonds; and Lm-LLO-NP: filled triangles. B. Tumor immunotherapeutic efficacy of LLO-Ova fusions.

FIG. 4. Splenocytes from Lm-LLO-E7-immunized mice proliferate when exposed to TC-1 cells. C57BL/6 mice were immunized and boosted with Lm-LLO-E7, Lm-E7, or control rLm strains. Splenocytes were harvested 6 days after the boost and plated with irradiated TC-1 cells at the ratios shown. The cells were pulsed with ³H thymidine and harvested. Cpm is defined as (experimental cpm)−(no-TC-1 control).

FIG. 5. Tumor immunotherapeutic efficacy of NP antigen expressed in LM. Tumor size in millimeters in mice is shown at 10, 17, 24, and 38 days post tumor-inoculation. Naive mice: X's; mice administered Lm-LLO-NP: filled diamonds; Lm-NP: squares; Lm-Gag: open circles.

FIG. 6. Depiction of vaccinia virus constructs expressing different forms of HPV16 E7 protein.

FIG. 7. Vac-LLO-E7 causes long-term regression of tumors established from 2×10⁵ TC-1 cells injected s.c. into C57BL/6 mice. Mice were injected 11 and 18 days after tumor challenge with 10⁷ PFU of Vac-LLO-E7, Vac-SigE7LAMP-1, or VacE7/mouse i.p. or were untreated (naive). 8 mice per treatment group were used, and the cross section for each tumor (average of 2 measurements) is shown for the indicated days after tumor inoculation.

FIG. 8A-B. SOE mutagenesis strategy. Decreasing/lowering the virulence of LLO was achieved by mutating the 4th domain of LLO. This domain contains a cholesterol binding site allowing it to bind to membranes where it oligomerizes to form pores. FIG. 8C. Shows fragments of full length LLO (rLLO529). Recombinant LLO, rLLO493, represents a LLO N-terminal fragment spanning from amino acids 1-493 (including the signal sequence). Recombinant LLO, rLLO482, represents an N-terminal LLO fragment (including a deletion of the cholesterol binding domain—amino acids 483-493-) spanning from amino acids 1-482 (including the signal sequence). Recombinant LLO, rLLO415, represents a N-terminal LLO fragment (including a deletion of the cholesterol binding domain—amino acids 483-493-) spanning from amino acids 1-415 (including the signal sequence). Recombinant LLO, rLLO59-415, represents a N-terminal LLO fragment that spans from amino acids 59-415 (excluding the cholesterol binding domain). Recombinant LLO, rLLO416-529, represents a N-terminal LLO fragment that spans from amino acids 416-529 and includes the cholesterol binding domain.

FIG. 9. Expression of mutant LLO proteins by Coomassie staining (A) and Western blot (B).

FIG. 10. Hemolytic activity of mutant LLO (mutLLO and ctLLO) proteins at pH 5.5 (A) and 7.4 (B).

FIG. 11. Expression of 38C13 soluble protein yields 2.34 mg soluble protein from the cell pellet per liter of induction medium. Induction of 38C13scFv protein expression in BL21* was performed using 1 mM IPTG in Superbroth containing 0.5% glycine and 1% triton X-100 at 20° C. for 16 hours. Soluble proteins were extracted from the cell pellet using a protocol including freeze/thaw in nonionic detergent, lysozyme and sonication. 38scFv proteins were purified from the extracted soluble proteins in the anti-idiotype sepharose column Samples from the affinity chromatography study were electophoresed on SDS-PAGE gels and Coumassie staining (A) or myc tag Western (B). The flow through (ft) and wash fractions contained the 38scFv protein, indicating the Id-Sepharose® column was overloaded with the protein. These fractions were re-loaded onto the Id-Sepharose® slurry and further recombinant protein recovered. Lanes: 1—M Wt; 2—soluble fraction; 3—ft; 4—wash at 1 ml; 5—wash at 100 ml; 6—pooled elution fraction.

FIG. 12. Strategy for 38scFv protein expression in E. coli and subsequent purification by affinity chromatography. Diagram shows the pathway for production of purified 38C13scFv and subsequent purification on an immunoaffinity column with the anti-Id antibody S1C5.

FIG. 13. ELISA assay to quantitate 38C13scFv production in induction cultures, to test correct folding of the protein after conjugation to immunogens, and to monitor the humoral immune response. The principle of the ELISA assay is depicted in (a). A standard curve (b) shows the change in A(405-490) for serial dilutions of purified 38scFv.

FIG. 14. Production of whole 38Id protein-LLO conjugates for vaccine studies. The 38C13 IgM protein was secreted by the 38C13A1.2 hybridoma into the bioreactor culture supernatant. The 38C13 IgM protein was purified from the culture supernatant using differential ammonium sulfate precipitation. Soluble LLO-His protein was expressed in E. coli following induction by IPTG, the soluble protein was then purified on a Ni+-NTA column and purity confirmed by Coumassie and Western blot using the LLO antibody B3-19. The 38C13 Id protein was conjugated to glutaraldehyde, dialyzed against PBS and passed through a Polymixin B column to remove endotoxin; endotoxin removal was confirmed by the LAL assay. The hemolytic activity of the 38Id-LLO conjugate was then tested using sheep red cells and compared to purified LLO, the 38Id-LLO was found to be non-hemolytic.

FIG. 15. Samples from differential ammonium sulfate precipitation of bioreactor supernatant following culture of the hybridoma 38C13A1.2 were run by SDS-PAGE gel and stained by Coumassie. The 38C13 idiotype protein was recovered from the 45% fraction and characterized in both reducing and non-reducing conditions.

FIG. 16. Soluble proteins were recovered from E. coli strain BL21* following an induction expression culture in LB medium and 1 mM IPTG for 18 hours at 30 C. Recombinant LLO-His was then purified on a Ni+-NTA column; the purity of the elution fractions were confirmed by SDS PAGE followed by a Coumassie stain or a Western blot performed using Mab B3-19.

FIG. 17. 38C13 idiotype (Id) protein was conjugated to either KLH (left panel) or LLO (right panel). Conjugation of 38C13 idiotype protein to KLH or LLO is complete, as confirmed by Coumassie stain on SDS-PAGE gel run under reducing and non-reducing conditions; both 38Id-KLH and 38Id-LLO conjugates show no evidence of free 38Id or the immunogenic proteins.

FIG. 18. Principle of the assay system designed to demonstrate the presence of the 38C13 idiotype epitope. The presence of the 38C13 idiotype epitope was confirmed using a blocking assay, in this system the anti-38C13 idiotype antibody S1C5-FITC is incubated with the Id protein or the conjugates 38Id-KLH or 38Id-LLO. Subsequently the binding of the S1C5-FITC to the 38C13 cell line B-cell receptor (BCR) is assessed by flow cytometry. In the presence of 38Id protein, the binding of S1C5-FITC to 38C13 lymphoma is impaired.

FIG. 19. 38C13 Id protein conjugated to LLO or KLH retains the binding site for the S1C5 MAb and inhibits binding of S1C5-FITC to 38C13 lymphoma cells. Arrow marks approximately 5-fold reduction in fluorescence. For unconjugated protein (top left panel), this corresponded to 100 ng protein. For 38Id-KLH, this corresponded to 10 mcg protein (upper right panel). For 38Id-LLO, this corresponded to between 100 ng-1 mcg protein (lower right panel).

FIG. 20. Id-LLO immunization protects mice from 38C13 lymphoma challenge. Mice were immunized with 38Id or 38Id conjugates and challenged with 38C13 lymphoma (A). The development of s.c. lymphoma was monitored for each mouse over the next 60 days (B), and the results presented as the frequency of each vaccine group tumor free. Statistical analysis was performed (non-parametric Kaplan-Meier, Log Rank Mantel-Cox test) using SPSS software. Asterisk-result is statistically different (p<0.05) from control groups.

FIG. 21. Id protein vaccine induces anti-idiotype antibodies when the Id protein is conjugated to KLH or LLO. Peripheral blood samples were collected from individual mice prior to and 12 days after each immunization. The serum samples were then tested by ELISA assay for the presence of anti-idiotype antibodies. The results for each vaccine group have been summarized in. Mice from the 38Id-LLO and 38Id-KLH vaccine groups were the only vaccine groups with sera positive for anti-idiotype antibodies (A). An isotyping assay was performed to characterize the anti-idiotype antibodies induced by 38Id-LLO versus 38Id-KLH. Following a single immunization with 38Id-LLO, a high titer polyclonal response was induced with equivalent levels of IgG1 and IgG2a anti-idioype antibodies (B). The level of the 38Id-LLO induced antibodies increased after the second immunization; however the ratio of IgG1:IgG2a (1.0) remained the same. In contrast, the 38Id-KLH vaccine induced a higher level of IgG1 versus IgG2a anti-idiotype antibodies after both immunizations (IgG1:IgG2a ratio was 1.8 and 1.3 respectively (B).

FIG. 22. Anti-idiotype antibodies are present in mouse serum after immunization and tumor challenges. To confirm the above results, the ability of immunized mouse serum to block binding of S1C5-FITC to 38C13 cells was measured, as a decrease in fluorescence by FACS. In the first experiment (A), the binding specificity of S1C5 to the 38C13 lymphoma idiotype was verified. Subsequently, the inhibition of S1C5 binding to 38C13 cells by mouse serum (taken at various stages through Id-LLO immunization and after tumor challenges) was investigated (B).

FIG. 23. Id-LLO immunization induces a Th1 response and antigen-specific CD8 T cells. Cells were harvested from DLN 14 days after s.c. immunization. CFSE-stained DLN cells were incubated with purified proteins for 5 days before being re-stimulated with PMA/Ionomycin for 5 hours in the presence of monensin. Cells were stained for surface CD4 and CD8, and then fixed and stained for intracellular cytokine. Percentage (mean±SD) of gated cells secreting cytokines is depicted. (A) CD4 T cell IFN-γ secretion; (B) CD4 T cell IL-4 secretion; (C) CD8 T cell IFN-γ secretion; (D) CD4 proliferation results. Student t-test was used to analyze the data; asterisk indicates a significantly different result with in vitro protein stimulation (p=<0.05) compared to media only in that vaccine group.

FIG. 24. Representative dot plots of CD4 CFSE proliferation assay. which FIG. 23D data were calculated. DLNs were collected 14 days after s.c. immunization and cells harvested. CFSE-stained DLN cells were then incubated with purified proteins for 5 days before being re-stimulated with PMA/Ionomycin for 5 hours in the presence of monensin. Cells were then stained for surface CD4 and CD8, fixed and stained for intracellular cytokine. Data was acquired on a FACSCalibur and analyzed by FlowJo software. Representative dotplots for CD4 CFSE proliferation are shown in FIG. 24.

FIG. 25. Co-inoculation of post-Id-LLO serum, CD4 or CD8 T cells inhibits the growth of 38C13 lymphoma cells. Transfer of serum, CD4 or CD8 T cells after Id-LLO immunization protects from in vivo challenge with 38C13 lymphoma. Experimental design is depicted in (A). Mice were immunized with 2 rounds of Id-LLO+mGMCSF; control group was naïve mice. Fourteen days after the second round of immunization, DLNs were collected and purified DLN CD4 or CD8 T cells were prepared as well as a pool of serum. The serum, CD4 or CD8 T cells were then co-inoculated s.c. with 38C13 cells on the left flank into recipient mice (8 per group), and mice were monitored for 60 days to assess lymphoma development. Results for serum transfer are shown in (B), CD4 or CD8 transfer in (C). Statistical analysis was performed (non-parametric Kaplan-Meier, Log Rank Mantel-Cox test) using SPSS software). Asterisk-statistical difference (p<0.05) in anti-tumor efficacy between effectors from immunized and naïve mice.

FIG. 26. Mice immunized with 38Id-KLH or 38Id-LLO are protected from 38C13 challenge on the opposite flank to the initial immunization and challenge.

FIG. 27. The ability of rLLO+rE7 chemically conjugated and rLLO+rE7 mixed together to impact on TC-1 growth.

FIG. 28. The ability of rE7 and rLLO protein to impact on TC-1 growth.

FIG. 29. The ability of recombinant detoxified LLOE7 (rDTLLO-E7; whole sequence) and rDTLLO-E7 (chimera) to impact on TC-1 growth.

FIG. 30. TC-1 tumor regression after immunization with rE7, rLLO, rLLO+E7 and rDTLLO-E7.

FIG. 31. TC-1 tumor regression after immunization with rDTLLO-chimera.

FIG. 32. TC-1 tumor regression after immunization with rE7, rDTLLO, rDTLLO+rE7, rDTLLO-E7 and rDT-LLO-E7-chimera.

FIG. 33. TC-1 tumor regression immunized with ActA−E7 and E7 protein.

FIG. 34. TC-1 tumor regression immunized with ActA+E7 and E7 protein.

FIG. 35. TC-1 tumor regression immunized with ActA and E7 protein.

FIG. 36. TC-1 tumor regression after immunization with rDTLLO-chimera

FIG. 37A. DetoxLLO Induces Cytokine mRNA expression by Bone Marrow (BM) Macrophages. 8e5 Day 7 BMDCs were thawed overnight at 37° C. in RF10 media. Next, BMDCs were centrifugated and resuspended in 1 mL of fresh RF10 at 37° C. for 1 hr. BMDCs were treated w/40 mcg/mL of LLOE7 and molar equivalents of E7 and LLO (or with PBS as negative control or 1 mcg/mL LPS as positive control). After 2 and 24 hrs, cells were collected by centrifugation and media saved for ELISA. RNA was extracted from cells and converted to cDNA. cDNA was then subjected to qPCR analysis with primers for various cytokines. This figure shows induction of TNF-α after 2 hours.

FIG. 37B shows induction of TNF-α after 24 hrs.

FIG. 37C shows induction of IL-12 after 2 hours.

FIG. 37D shows induction of IL-12 after 24 hrs.

FIG. 37E shows induction of ISG15 after 24 hours.

FIG. 38A. Detox LLO Induces Cytokine Secretion by BM Macrophages. Same treatment protocol as described for FIG. 37, except media was subjected to ELISA analysis after treatments. This figure shows induction of TNF-α after 2 hours and 24 hours.

FIG. 38B. Detox LLO Induces Cytokine Secretion by BM Macrophages. Same treatment protocol as described for FIG. 37, except media was subjected to ELISA analysis after treatments. This figure shows induction of IL-12 after 2 hours and 24 hours.

FIG. 39A. Detox LLO Upregulates DC Maturation Markers. Bone marrow was collected from the femurs of C57BL/6 mice at 6-8 wk of age. After 7 days of culture, nonadherent cells were collected, washed, and plated at 2×10^6/ml and then pulsed with either E7 (10 mcg/ml), LLO (40 mcg/ml), or LLOE7 (50 mcg/ml) plus LLO (40 mcg/ml) for 16 hr in 37° C., 5% CO₂. Cells were stained with APC-labeled mAbs specific for mouse CD11c, or FITC-labeled mAb specific for mouse CD86, MHC class II, CD40. Isotype-matched mouse IgG was used as a negative control and subtracted from the background. Cells were incubated with mAbs for 30 min at 4° C. in the dark. Following two washes with PBS, 10 μl of 7AAD (Beckman Coulter, Marseille, France) was added 10 min before cells were analyzed on a FACS flow cytometer. The live cell population is shown as percentage of CD11c positive cells. This figure shows upregulation of CD86 as compared to controls.

FIG. 39B shows upregulation of CD40 as compared to controls.

FIG. 39C shows upregulation of MHCII as compared to controls.

FIG. 40. Regression of TC-1 Tumors by LLO-fused E7. 2×10^5 TC-1 tumor cells were established s.c in 8 mice per vaccine group. Mice were immunized s.c. with 50 μg of E7, 200 μg of LLO, 250 μg of LLOE7, or 50 μg of E7 plus 200 μg of LLO on Days 3 and 10.

FIG. 41. Nuclear translocation of NFkappaB after stimulation with Dt.LLO. J774 macrophage cell line used as model system for antigen presenting cells (APCs). 5×10^ 5 cells per well (6 well dish) were plated in a total volume 1 ml. Cells were stained with anti-NF-κB (P65)-FITC (green fluorescence) and DAPI for nucleus (blue fluorescence). In B, D, and F, cells were also stained after 24 hours with anti-CD11B-PE (M1/170, eBioscence). The fluorescent micrograph is shown at 40× magnification. NF-kappaB is located in the cytoplasm after treatment of cells with media alone (no activation) (A). Media-treated cells demonstrate weak Cd11b staining (B). After overnight (24 hr) stimulation with Dt.LLO (30 mcg), NFkappaB moved out of the cytoplasm into the nucleus (C) and there is an increase in CD11b staining (D). Similarly, after overnight stimulation (24 hr) with LPS (10 mcg/ml, positive control), NFkappaB was translocated to the nucleus (E), which is more discernible with the halo made by the increased CD11b+ staining of the plasma membrane (F).

DETAILED DESCRIPTION OF THE INVENTION

The present invention provides recombinant proteins and peptides comprising a mutated listeriolysin O (LLO) protein or fragment thereof, comprising a substitution or internal deletion that includes the cholesterol-binding domain, fusion peptides comprising same, nucleotide molecules encoding same, and vaccine vectors comprising or encoding same. The present invention also provides methods of utilizing recombinant peptides, nucleotide molecules, and vaccine vectors of the present invention to induce an immune response.

In one embodiment, the present invention provides a recombinant protein or polypeptide comprising a listeriolysin O (LLO) protein, wherein said LLO protein comprises a mutation of residues C484, W491, W492, or a combination thereof of the cholesterol-binding domain (CBD) of said LLO protein. In one embodiment, said C484, W491, and W492 residues are residues C484, W491, and W492 of SEQ ID NO: 37, while in another embodiment, they are corresponding residues as can be deduced using sequence alignments, as is known to one of skill in the art. In one embodiment, residues C484, W491, and W492 are mutated. In one embodiment, a mutation is a substitution, in another embodiment, a deletion. In one embodiment, the entire CBD is mutated, while in another embodiment, portions of the CBD are mutated, while in another embodiment, only specific residues within the CBD are mutated.

In another embodiment, the LLO fragment is an N-terminal LLO fragment. In another embodiment, the LLO fragment is at least 492 amino acids (AA) long. In another embodiment, the LLO fragment is 492-528 AA long. In another embodiment, the non-LLO peptide is 1-50 amino acids long. In another embodiment, the mutated region is 1-50 amino acids long. In another embodiment, the non-LLO peptide is the same length as the mutated region. In another embodiment, the non-LLO peptide is shorter, or in another embodiment, longer, than the mutated region. In another embodiment, the substitution is an inactivating mutation with respect to hemolytic activity. In another embodiment, the recombinant peptide exhibits a reduction in hemolytic activity relative to wild-type LLO. In another embodiment, the recombinant peptide is non-hemolytic. Each possibility represents a separate embodiment of the present invention.

In one embodiment, the present invention provides a recombinant protein or polypeptide comprising a mutated LLO protein or fragment thereof, wherein the mutated LLO protein or fragment thereof contains a substitution of a non-LLO peptide for a mutated region of the mutated LLO protein or fragment thereof, the mutated region comprising a residue selected from C484, W491, and W492. In another embodiment, the LLO fragment is an N-terminal LLO fragment. In another embodiment, the LLO fragment is at least 492 amino acids (AA) long. In another embodiment, the LLO fragment is 492-528 AA long. In another embodiment, the non-LLO peptide is 1-50 amino acids long. In another embodiment, the mutated region is 1-50 amino acids long. In another embodiment, the non-LLO peptide is the same length as the mutated region. In another embodiment, the non-LLO peptide has a length different from the mutated region. In another embodiment, the substitution is an inactivating mutation with respect to hemolytic activity. In another embodiment, the recombinant protein or polypeptide exhibits a reduction in hemolytic activity relative to wild-type LLO. In another embodiment, the recombinant protein or polypeptide is non-hemolytic. Each possibility represents a separate embodiment of the present invention.

As provided herein, a mutant LLO protein was created wherein residues C484, W491, and W492 of LLO were substituted with alanine residues (Example 5). The mutated LLO protein, mutLLO, could be expressed and purified in an E. coli expression system (Example 7) and exhibited substantially reduced hemolytic activity relative to wild-type LLO (Example 8).

In another embodiment, the present invention provides a recombinant protein or polypeptide comprising a mutated LLO protein or fragment thereof, wherein the mutated LLO protein or fragment thereof contains a substitution of a non-LLO peptide for a mutated region of the mutated LLO protein or fragment thereof, the mutated region comprising the cholesterol-binding domain (CBD) of the mutated LLO protein or fragment thereof. In another embodiment, the LLO fragment is an N-terminal LLO fragment. In another embodiment, the LLO fragment is at least 492 AA long. In another embodiment, the LLO fragment is 492-528 AA long. In another embodiment, the non-LLO peptide is 1-50 amino acids long. In another embodiment, the mutated region is 11-50 amino acids long. In another embodiment, the non-LLO peptide is the same length as the mutated region. In another embodiment, the non-LLO peptide has a length different from the mutated region. In another embodiment, the substitution is an inactivating mutation with respect to hemolytic activity. In another embodiment, the recombinant protein or polypeptide exhibits a reduction in hemolytic activity relative to wild-type LLO. In another embodiment, the recombinant protein or polypeptide is non-hemolytic. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a recombinant protein or polypeptide comprising a mutated LLO protein or fragment thereof, wherein the mutated LLO protein or fragment thereof contains a substitution of a non-LLO peptide for a mutated region of the mutated LLO protein or fragment thereof, wherein the mutated region is a fragment of the CBD of the mutated LLO protein or fragment thereof. In another embodiment, the LLO fragment is an N-terminal LLO fragment. In another embodiment, the LLO fragment is at least 492 AA long. In another embodiment, the LLO fragment is 492-528 AA long. In another embodiment, the non-LLO peptide is 1-50 amino acids long. In another embodiment, the mutated region is 1-11 amino acids long. In another embodiment, the non-LLO peptide is the same length as the mutated region. In another embodiment, the non-LLO peptide has a length different from the mutated region. In another embodiment, the substitution is an inactivating mutation with respect to hemolytic activity. In another embodiment, the recombinant protein or polypeptide exhibits a reduction in hemolytic activity relative to wild-type LLO. In another embodiment, the recombinant protein or polypeptide is non-hemolytic. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a recombinant protein or polypeptide comprising a mutated LLO protein or fragment thereof, wherein the mutated LLO protein or fragment thereof contains a substitution of a 1-50 amino acid non-LLO peptide for a 1-50 amino acid mutated region of the mutated LLO protein or fragment thereof, wherein the mutated region overlaps the CBD of the mutated LLO protein or fragment thereof. In another embodiment, the LLO fragment is an N-terminal LLO fragment. In another embodiment, the LLO fragment is at least 492 AA long. In another embodiment, the LLO fragment is 492-528 AA long. In another embodiment, the substitution is an inactivating mutation with respect to hemolytic activity. In another embodiment, the recombinant protein or polypeptide exhibits a reduction in hemolytic activity relative to wild-type LLO. In another embodiment, the recombinant protein or polypeptide is non-hemolytic. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a recombinant protein or polypeptide comprising (a) a mutated LLO protein, wherein the mutated LLO protein contains an internal deletion, the internal deletion comprising the cholesterol-binding domain of the mutated LLO protein; and (b) a heterologous peptide of interest. In another embodiment, the sequence of the cholesterol-binding domain is set forth in SEQ ID NO: 18. In another embodiment, the internal deletion is an 11-50 amino acid internal deletion. In another embodiment, the internal deletion is inactivating with regard to the hemolytic activity of the recombinant protein or polypeptide. In another embodiment, the recombinant protein or polypeptide exhibits a reduction in hemolytic activity relative to wild-type LLO. Each possibility represents another embodiment of the present invention.

In another embodiment, the present invention provides a recombinant protein or polypeptide comprising (a) a mutated LLO protein, wherein the mutated LLO protein contains an internal deletion, the internal deletion comprising comprises a residue selected from C484, W491, and W492 of the mutated LLO protein; and (b) a heterologous peptide of interest. In another embodiment, the internal deletion is a 1-50 amino acid internal deletion. In another embodiment, the internal deletion is inactivating with regard to the hemolytic activity of the recombinant protein or polypeptide. In another embodiment, the recombinant protein or polypeptide exhibits a reduction in hemolytic activity relative to wild-type LLO. Each possibility represents another embodiment of the present invention.

In another embodiment, the present invention provides a recombinant protein or polypeptide comprising (a) a mutated LLO protein, wherein the mutated LLO protein contains an internal deletion, the internal deletion comprising a fragment of the cholesterol-binding domain of the mutated LLO protein; and (b) a heterologous peptide of interest. In another embodiment, the internal deletion is a 1-11 amino acid internal deletion. In another embodiment, the sequence of the cholesterol-binding domain is set forth in SEQ ID NO: 18. In another embodiment, the internal deletion is inactivating with regard to the hemolytic activity of the recombinant protein or polypeptide. In another embodiment, the recombinant protein or polypeptide exhibits a reduction in hemolytic activity relative to wild-type LLO. Each possibility represents another embodiment of the present invention.

In another embodiment, the present invention provides a vaccine comprising an adjuvant, a recombinant protein or polypeptide of the present invention, and a heterologous peptide of interest. In another embodiment, the present invention provides a composition comprising an adjuvant, a recombinant protein or polypeptide of the present invention, and a heterologous antigenic peptide of interest. In another embodiment, the recombinant protein or polypeptide is not covalently bound to the heterologous peptide of interest. Each possibility represents a separate embodiment of the present invention.

The mutated region of methods and compositions of the present invention comprises, in another embodiment, residue C484 of SEQ ID NO: 37. In another embodiment, the mutated region comprises a corresponding cysteine residue of a homologous LLO protein. In another embodiment, the mutated region comprises residue W491 of SEQ ID NO: 37. In another embodiment, the mutated region comprises a corresponding tryptophan residue of a homologous LLO protein. In another embodiment, the mutated region comprises residue W492 of SEQ ID NO: 37. In another embodiment, the mutated region comprises a corresponding tryptophan residue of a homologous LLO protein. Methods for identifying corresponding residues of a homologous protein are well known in the art, and include, for example, sequence alignment. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the mutated region comprises residues C484 and W491. In another embodiment, the mutated region comprises residues C484 and W492. In another embodiment, the mutated region comprises residues W491 and W492. In another embodiment, the mutated region comprises residues C484, W491, and W492. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the mutated region of methods and compositions of the present invention comprises the cholesterol-binding domain of the mutated LLO protein or fragment thereof. For example, a mutated region consisting of residues 470-500, 470-510, or 480-500 of SEQ ID NO: 37 comprises the CBD thereof (residues 483-493). In another embodiment, the mutated region is a fragment of the CBD of the mutated LLO protein or fragment thereof. For example, as provided herein, residues C484, W491, and W492, each of which is a fragment of the CBD, were mutated to alanine residues (Example 5). Further, as provided herein, a fragment of the CBD, residues 484-492, was replaced with a heterologous sequence from NY-ESO-1 (Example 6). In another embodiment, the mutated region overlaps the CBD of the mutated LLO protein or fragment thereof. For example, a mutated region consisting of residues 470-490, 480-488, 490-500, or 486-510 of SEQ ID NO: 37 comprises the CBD thereof. In another embodiment, a single peptide may have a deletion in the signal sequence and a mutation or substitution in the CBD. Each possibility represents a separate embodiment of the present invention.

The length of the mutated region is, in another embodiment, 1-50 AA. In another embodiment, the length is 1-11 AA. In another embodiment, the length is 2-11 AA. In another embodiment, the length is 3-11 AA. In another embodiment, the length is 4-11 AA. In another embodiment, the length is 5-11 AA. In another embodiment, the length is 6-11 AA. In another embodiment, the length is 7-11 AA. In another embodiment, the length is 8-11 AA. In another embodiment, the length is 9-11 AA. In another embodiment, the length is 10-11 AA. In another embodiment, the length is 1-2 AA. In another embodiment, the length is 1-3 AA. In another embodiment, the length is 1-4 AA. In another embodiment, the length is 1-5 AA. In another embodiment, the length is 1-6 AA. In another embodiment, the length is 1-7 AA. In another embodiment, the length is 1-8 AA. In another embodiment, the length is 1-9 AA. In another embodiment, the length is 1-10 AA. In another embodiment, the length is 2-3 AA. In another embodiment, the length is 2-4 AA. In another embodiment, the length is 2-5 AA. In another embodiment, the length is 2-6 AA. In another embodiment, the length is 2-7 AA. In another embodiment, the length is 2-8 AA. In another embodiment, the length is 2-9 AA. In another embodiment, the length is 2-10 AA. In another embodiment, the length is 3-4 AA. In another embodiment, the length is 3-5 AA. In another embodiment, the length is 3-6 AA. In another embodiment, the length is 3-7 AA. In another embodiment, the length is 3-8 AA. In another embodiment, the length is 3-9 AA. In another embodiment, the length is 3-10 AA. In another embodiment, the length is 11-50 AA. In another embodiment, the length is 12-50 AA. In another embodiment, the length is 11-15 AA. In another embodiment, the length is 11-20 AA. In another embodiment, the length is 11-25 AA. In another embodiment, the length is 11-30 AA. In another embodiment, the length is 11-35 AA. In another embodiment, the length is 11-40 AA. In another embodiment, the length is 11-60 AA. In another embodiment, the length is 11-70 AA. In another embodiment, the length is 11-80 AA. In another embodiment, the length is 11-90 AA. In another embodiment, the length is 11-100 AA. In another embodiment, the length is 11-150 AA. In another embodiment, the length is 15-20 AA. In another embodiment, the length is 15-25 AA. In another embodiment, the length is 15-30 AA. In another embodiment, the length is 15-35 AA. In another embodiment, the length is 15-40 AA. In another embodiment, the length is 15-60 AA. In another embodiment, the length is 15-70 AA. In another embodiment, the length is 15-80 AA. In another embodiment, the length is 15-90 AA. In another embodiment, the length is 15-100 AA. In another embodiment, the length is 15-150 AA. In another embodiment, the length is 20-25 AA. In another embodiment, the length is 20-30 AA. In another embodiment, the length is 20-35 AA. In another embodiment, the length is 20-40 AA. In another embodiment, the length is 20-60 AA. In another embodiment, the length is 20-70 AA. In another embodiment, the length is 20-80 AA. In another embodiment, the length is 20-90 AA. In another embodiment, the length is 20-100 AA. In another embodiment, the length is 20-150 AA. In another embodiment, the length is 30-35 AA. In another embodiment, the length is 30-40 AA. In another embodiment, the length is 30-60 AA. In another embodiment, the length is 30-70 AA. In another embodiment, the length is 30-80 AA. In another embodiment, the length is 30-90 AA. In another embodiment, the length is 30-100 AA. In another embodiment, the length is 30-150 AA. Each possibility represents another embodiment of the present invention.

The substitution mutation of methods and compositions of the present invention is, in another embodiment, a mutation wherein the mutated region of the LLO protein or fragment thereof is replaced by an equal number of heterologous AA. In another embodiment, a larger number of heterologous AA than the size of the mutated region is introduced. In another embodiment, a smaller number of heterologous AA than the size of the mutated region is introduced. Each possibility represents another embodiment of the present invention.

In another embodiment, the substitution mutation is a point mutation of a single residue. In another embodiment, the substitution mutation is a point mutation of 2 residues. In another embodiment, the substitution mutation is a point mutation of 3 residues. In another embodiment, the substitution mutation is a point mutation of more than 3 residues. In another embodiment, the substitution mutation is a point mutation of several residues. In another embodiment, the multiple residues included in the point mutation are contiguous. In another embodiment, the multiple residues are not contiguous. Each possibility represents another embodiment of the present invention.

The length of the non-LLO peptide that replaces the mutated region of recombinant protein or polypeptides of the present invention is, in another embodiment, 1-50 AA. In another embodiment, the length is 1-11 AA. In another embodiment, the length is 2-11 AA. In another embodiment, the length is 3-11 AA. In another embodiment, the length is 4-11 AA. In another embodiment, the length is 5-11 AA. In another embodiment, the length is 6-11 AA. In another embodiment, the length is 7-11 AA. In another embodiment, the length is 8-11 AA. In another embodiment, the length is 9-11 AA. In another embodiment, the length is 10-11 AA. In another embodiment, the length is 1-2 AA. In another embodiment, the length is 1-3 AA. In another embodiment, the length is 1-4 AA. In another embodiment, the length is 1-5 AA. In another embodiment, the length is 1-6 AA. In another embodiment, the length is 1-7 AA. In another embodiment, the length is 1-8 AA. In another embodiment, the length is 1-9 AA. In another embodiment, the length is 1-10 AA. In another embodiment, the length is 2-3 AA. In another embodiment, the length is 2-4 AA. In another embodiment, the length is 2-5 AA. In another embodiment, the length is 2-6 AA. In another embodiment, the length is 2-7 AA. In another embodiment, the length is 2-8 AA. In another embodiment, the length is 2-9 AA. In another embodiment, the length is 2-10 AA. In another embodiment, the length is 3-4 AA. In another embodiment, the length is 3-5 AA. In another embodiment, the length is 3-6 AA. In another embodiment, the length is 3-7 AA. In another embodiment, the length is 3-8 AA. In another embodiment, the length is 3-9 AA. In another embodiment, the length is 3-10 AA. In another embodiment, the length is 11-50 AA. In another embodiment, the length is 12-50 AA. In another embodiment, the length is 11-15 AA. In another embodiment, the length is 11-20 AA. In another embodiment, the length is 11-25 AA. In another embodiment, the length is 11-30 AA. In another embodiment, the length is 11-35 AA. In another embodiment, the length is 11-40 AA. In another embodiment, the length is 11-60 AA. In another embodiment, the length is 11-70 AA. In another embodiment, the length is 11-80 AA. In another embodiment, the length is 11-90 AA. In another embodiment, the length is 11-100 AA. In another embodiment, the length is 11-150 AA. In another embodiment, the length is 15-20 AA. In another embodiment, the length is 15-25 AA. In another embodiment, the length is 15-30 AA. In another embodiment, the length is 15-35 AA. In another embodiment, the length is 15-40 AA. In another embodiment, the length is 15-60 AA. In another embodiment, the length is 15-70 AA. In another embodiment, the length is 15-80 AA. In another embodiment, the length is 15-90 AA. In another embodiment, the length is 15-100 AA. In another embodiment, the length is 15-150 AA. In another embodiment, the length is 20-25 AA. In another embodiment, the length is 20-30 AA. In another embodiment, the length is 20-35 AA. In another embodiment, the length is 20-40 AA. In another embodiment, the length is 20-60 AA. In another embodiment, the length is 20-70 AA. In another embodiment, the length is 20-80 AA. In another embodiment, the length is 20-90 AA. In another embodiment, the length is 20-100 AA. In another embodiment, the length is 20-150 AA. In another embodiment, the length is 30-35 AA. In another embodiment, the length is 30-40 AA. In another embodiment, the length is 30-60 AA. In another embodiment, the length is 30-70 AA. In another embodiment, the length is 30-80 AA. In another embodiment, the length is 30-90 AA. In another embodiment, the length is 30-100 AA. In another embodiment, the length is 30-150 AA. Each possibility represents another embodiment of the present invention.

In another embodiment, the length of the LLO fragment of methods and compositions of the present invention is at least 484 AA. In another embodiment, the length is over 484 AA. In another embodiment, the length is at least 489 AA. In another embodiment, the length is over 489. In another embodiment, the length is at least 493 AA. In another embodiment, the length is over 493. In another embodiment, the length is at least 500 AA. In another embodiment, the length is over 500. In another embodiment, the length is at least 505 AA. In another embodiment, the length is over 505. In another embodiment, the length is at least 510 AA. In another embodiment, the length is over 510. In another embodiment, the length is at least 515 AA. In another embodiment, the length is over 515. In another embodiment, the length is at least 520 AA. In another embodiment, the length is over 520. In another embodiment, the length is at least 525 AA. In another embodiment, the length is over 520. When referring to the length of an LLO fragment herein, the signal sequence is included. Thus, the numbering of the first cysteine in the CBD is 484, and the total number of AA residues is 529. Each possibility represents another embodiment of the present invention.

In another embodiment, the present invention provides a recombinant protein or polypeptide comprising (a) a mutated LLO protein, wherein the mutated LLO protein contains an internal deletion, the internal deletion comprising the cholesterol-binding domain of the mutated LLO protein; and (b) a heterologous peptide of interest. In another embodiment, the sequence of the cholesterol-binding domain is set forth in SEQ ID NO: 18. In another embodiment, the internal deletion is an 11-50 amino acid internal deletion. In another embodiment, the internal deletion is inactivating with regard to the hemolytic activity of the recombinant protein or polypeptide. In another embodiment, the recombinant protein or polypeptide exhibits a reduction in hemolytic activity relative to wild-type LLO. Each possibility represents another embodiment of the present invention.

In another embodiment, the present invention provides a recombinant protein or polypeptide comprising (a) a mutated LLO protein, wherein the mutated LLO protein contains an internal deletion, the internal deletion comprising comprises a residue selected from C484, W491, and W492 of the mutated LLO protein; and (b) a heterologous peptide of interest. In another embodiment, the internal deletion is a 1-50 amino acid internal deletion. In another embodiment, the sequence of the cholesterol-binding domain is set forth in SEQ ID NO: 18. In another embodiment, the internal deletion is inactivating with regard to the hemolytic activity of the recombinant protein or polypeptide. In another embodiment, the recombinant protein or polypeptide exhibits a reduction in hemolytic activity relative to wild-type LLO. Each possibility represents another embodiment of the present invention.

In another embodiment, the present invention provides a recombinant protein or polypeptide comprising (a) a mutated LLO protein, wherein the mutated LLO protein contains an internal deletion, the internal deletion comprising a fragment of the cholesterol-binding domain of the mutated LLO protein; and (b) a heterologous peptide of interest. In another embodiment, the internal deletion is a 1-11 amino acid internal deletion. In another embodiment, the sequence of the cholesterol-binding domain is set forth in SEQ ID NO: 18. In another embodiment, the internal deletion is inactivating with regard to the hemolytic activity of the recombinant protein or polypeptide. In another embodiment, the recombinant protein or polypeptide exhibits a reduction in hemolytic activity relative to wild-type LLO. Each possibility represents another embodiment of the present invention.

In another embodiment, a peptide of the present invention is a fusion peptide. In another embodiment, “fusion peptide” refers to a peptide or polypeptide comprising two or more proteins linked together by peptide bonds or other chemical bonds. In another embodiment, the proteins are linked together directly by a peptide or other chemical bond. In another embodiment, the proteins are linked together with one or more AA (e.g. a “spacer”) between the two or more proteins. Each possibility represents a separate embodiment of the present invention.

As provided herein, a mutant LLO protein was created wherein residues C484, W491, and W492 of LLO were substituted with a CTL epitope from the antigen NY-ESO-1 (Example 6). The mutated LLO protein, mutLLO, could be expressed and purified in an E. coli expression system (Example 7) and exhibited substantially reduced hemolytic activity relative to wild-type LLO (Example 8).

The length of the internal deletion of methods and compositions of the present invention is, in another embodiment, 1-50 AA. In another embodiment, the length is 1-11 AA. In another embodiment, the length is 2-11 AA. In another embodiment, the length is 3-11 AA. In another embodiment, the length is 4-11 AA. In another embodiment, the length is 5-11 AA. In another embodiment, the length is 6-11 AA. In another embodiment, the length is 7-11 AA. In another embodiment, the length is 8-11 AA. In another embodiment, the length is 9-11 AA. In another embodiment, the length is 10-11 AA. In another embodiment, the length is 1-2 AA. In another embodiment, the length is 1-3 AA. In another embodiment, the length is 1-4 AA. In another embodiment, the length is 1-5 AA. In another embodiment, the length is 1-6 AA. In another embodiment, the length is 1-7 AA. In another embodiment, the length is 1-8 AA. In another embodiment, the length is 1-9 AA. In another embodiment, the length is 1-10 AA. In another embodiment, the length is 2-3 AA. In another embodiment, the length is 2-4 AA. In another embodiment, the length is 2-5 AA. In another embodiment, the length is 2-6 AA. In another embodiment, the length is 2-7 AA. In another embodiment, the length is 2-8 AA. In another embodiment, the length is 2-9 AA. In another embodiment, the length is 2-10 AA. In another embodiment, the length is 3-4 AA. In another embodiment, the length is 3-5 AA. In another embodiment, the length is 3-6 AA. In another embodiment, the length is 3-7 AA. In another embodiment, the length is 3-8 AA. In another embodiment, the length is 3-9 AA. In another embodiment, the length is 3-10 AA. In another embodiment, the length is 11-50 AA. In another embodiment, the length is 12-50 AA. In another embodiment, the length is 11-15 AA. In another embodiment, the length is 11-20 AA. In another embodiment, the length is 11-25 AA. In another embodiment, the length is 11-30 AA. In another embodiment, the length is 11-35 AA. In another embodiment, the length is 11-40 AA. In another embodiment, the length is 11-60 AA. In another embodiment, the length is 11-70 AA. In another embodiment, the length is 11-80 AA. In another embodiment, the length is 11-90 AA. In another embodiment, the length is 11-100 AA. In another embodiment, the length is 11-150 AA. In another embodiment, the length is 15-20 AA. In another embodiment, the length is 15-25 AA. In another embodiment, the length is 15-30 AA. In another embodiment, the length is 15-35 AA. In another embodiment, the length is 15-40 AA. In another embodiment, the length is 15-60 AA. In another embodiment, the length is 15-70 AA. In another embodiment, the length is 15-80 AA. In another embodiment, the length is 15-90 AA. In another embodiment, the length is 15-100 AA. In another embodiment, the length is 15-150 AA. In another embodiment, the length is 20-25 AA. In another embodiment, the length is 20-30 AA. In another embodiment, the length is 20-35 AA. In another embodiment, the length is 20-40 AA. In another embodiment, the length is 20-60 AA. In another embodiment, the length is 20-70 AA. In another embodiment, the length is 20-80 AA. In another embodiment, the length is 20-90 AA. In another embodiment, the length is 20-100 AA. In another embodiment, the length is 20-150 AA. In another embodiment, the length is 30-35 AA. In another embodiment, the length is 30-40 AA. In another embodiment, the length is 30-60 AA. In another embodiment, the length is 30-70 AA. In another embodiment, the length is 30-80 AA. In another embodiment, the length is 30-90 AA. In another embodiment, the length is 30-100 AA. In another embodiment, the length is 30-150 AA. Each possibility represents another embodiment of the present invention.

In another embodiment, the mutated LLO protein of the present invention that comprises an internal deletion is full length except for the internal deletion. In another embodiment, the mutated LLO protein comprises an additional internal deletion. In another embodiment, the mutated LLO protein comprises more than one additional internal deletion. In another embodiment, the mutated LLO protein is truncated from the C-terminal end. In another embodiment, the mutated LLO protein is truncated from the N-terminal end. Each possibility represents another embodiment of the present invention.

The internal deletion of methods and compositions of the present invention comprises, in another embodiment, residue C484 of SEQ ID NO: 37. In another embodiment, the internal deletion comprises a corresponding cysteine residue of a homologous LLO protein. In another embodiment, the internal deletion comprises residue W491 of SEQ ID NO: 37. In another embodiment, the internal deletion comprises a corresponding tryptophan residue of a homologous LLO protein. In another embodiment, the internal deletion comprises residue W492 of SEQ ID NO: 37. In another embodiment, the internal deletion comprises a corresponding tryptophan residue of a homologous LLO protein. Methods for identifying corresponding residues of a homologous protein are well known in the art, and include, for example, sequence alignment. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the internal deletion comprises residues C484 and W491. In another embodiment, the internal deletion comprises residues C484 and W492. In another embodiment, the internal deletion comprises residues W491 and W492. In another embodiment, the internal deletion comprises residues C484, W491, and W492. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the internal deletion of methods and compositions of the present invention comprises the CBD of the mutated LLO protein or fragment thereof. For example, an internal deletion consisting of residues 470-500, 470-510, or 480-500 of SEQ ID NO: 37 comprises the CBD thereof (residues 483-493). In another embodiment, the internal deletion is a fragment of the CBD of the mutated LLO protein or fragment thereof. For example, residues 484-492, 485-490, and 486-488 are all fragments of the CBD of SEQ ID NO: 37. In another embodiment, the internal deletion overlaps the CBD of the mutated LLO protein or fragment thereof. For example, an internal deletion consisting of residues 470-490, 480-488, 490-500, or 486-510 of SEQ ID NO: 37 comprises the CBD thereof. Each possibility represents a separate embodiment of the present invention.

“Hemolytic” refers, in another embodiment, to ability to lyse a eukaryotic cell. In another embodiment, the eukaryotic cell is a red blood cell. In another embodiment, the eukaryotic cell is any other type of eukaryotic cell known in the art. In another embodiment, hemolytic activity is measured at an acidic pH. In another embodiment, hemolytic activity is measured at physiologic pH. In another embodiment, hemolytic activity is measured at pH 5.5. In another embodiment, hemolytic activity is measured at pH 7.4. In another embodiment, hemolytic activity is measured at any other pH known in the art.

In another embodiment, a recombinant protein or polypeptide of methods and compositions of the present invention exhibits a greater than 100-fold reduction in hemolytic activity relative to wild-type LLO. In another embodiment, the recombinant protein or polypeptide exhibits a greater than 50-fold reduction in hemolytic activity. In another embodiment, the reduction is greater than 30-fold. In another embodiment, the reduction is greater than 40-fold. In another embodiment, the reduction is greater than 60-fold. In another embodiment, the reduction is greater than 70-fold. In another embodiment, the reduction is greater than 80-fold. In another embodiment, the reduction is greater than 90-fold. In another embodiment, the reduction is greater than 120-fold. In another embodiment, the reduction is greater than 150-fold. In another embodiment, the reduction is greater than 200-fold. In another embodiment, the reduction is greater than 250-fold. In another embodiment, the reduction is greater than 300-fold. In another embodiment, the reduction is greater than 400-fold. In another embodiment, the reduction is greater than 500-fold. In another embodiment, the reduction is greater than 600-fold. In another embodiment, the reduction is greater than 800-fold. In another embodiment, the reduction is greater than 1000-fold. In another embodiment, the reduction is greater than 1200-fold. In another embodiment, the reduction is greater than 1500-fold. In another embodiment, the reduction is greater than 2000-fold. In another embodiment, the reduction is greater than 3000-fold. In another embodiment, the reduction is greater than 5000-fold.

In another embodiment, the reduction is at least 100-fold. In another embodiment, the reduction is at least 50-fold. In another embodiment, the reduction is at least 30-fold. In another embodiment, the reduction is at least 40-fold. In another embodiment, the reduction is at least 60-fold. In another embodiment, the reduction is at least 70-fold. In another embodiment, the reduction is at least 80-fold. In another embodiment, the reduction is at least 90-fold. In another embodiment, the reduction is at least 120-fold. In another embodiment, the reduction is at least 150-fold. In another embodiment, the reduction is at least 200-fold. In another embodiment, the reduction is at least 250-fold. In another embodiment, the reduction is at least 300-fold. In another embodiment, the reduction is at least 400-fold. In another embodiment, the reduction is at least 500-fold. In another embodiment, the reduction is at least 600-fold. In another embodiment, the reduction is at least 800-fold. In another embodiment, the reduction is at least 1000-fold. In another embodiment, the reduction is at least 1200-fold. In another embodiment, the reduction is at least 1500-fold. In another embodiment, the reduction is at least 2000-fold. In another embodiment, the reduction is at least 3000-fold. In another embodiment, the reduction is at least 5000-fold.

Methods of determining hemolytic activity are well known in the art, and are described, for example, in the Examples herein, and in Portnoy D A et al, (J Exp Med Vol 167:1459-1471, 1988) and Dancz C E et al (J Bacteriol. 184: 5935-5945, 2002).

“Inactivating mutation” with respect to hemolytic activity refers, in another embodiment, to a mutation that abolishes detectable hemolytic activity. In another embodiment, the term refers to a mutation that abolishes hemolytic activity at pH 5.5. In another embodiment, the term refers to a mutation that abolishes hemolytic activity at pH 7.4. In another embodiment, the term refers to a mutation that significantly reduces hemolytic activity at pH 5.5. In another embodiment, the term refers to a mutation that significantly reduces hemolytic activity at pH 7.4. In another embodiment, the term refers to a mutation that significantly reduces hemolytic activity at pH 5.5. In another embodiment, the term refers to any other type of inactivating mutation with respect to hemolytic activity. Each possibility represents another embodiment of the present invention.

In another embodiment, the sequence of the cholesterol-binding domain of methods and compositions of the present invention is set forth in SEQ ID NO: 18. In another embodiment, the CBD is any other LLO CBD known in the art. Each possibility represents another embodiment of the present invention.

The non-LLO sequence of methods and compositions of the present invention is, in another embodiment, a heterologous sequence. In another embodiment, the non-LLO sequence is a synthetic sequence. In another embodiment, the non-LLO sequence is a non-naturally occurring sequence. In another embodiment, the non-LLO sequence is a non-Listeria sequence. In another embodiment, the non-LLO sequence is a non-Listeria monocytogenes sequence. In one embodiment, the compositions of the present invention comprise a mutated LLO in which there is a substitution of an amino acid peptide comprising a CBD for an amino acid comprising a non-LLO peptide and further comprising a heterologous antigen fused to said mutated LLO. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the mutated LLO protein or fragment thereof of methods and compositions of the present invention comprises the signal peptide thereof. In another embodiment, the mutated LLO protein or fragment thereof comprises a signal peptide of a wild-type LLO protein. In another embodiment, the signal peptide is a short (3-60 amino acid long) peptide chain that directs the post-translational transport of a protein. In another embodiment, signal peptides are also targeting signals, signal sequences, transit peptides, or localization signals. In another embodiment, the amino acid sequences of signal peptides direct proteins to certain organelles such as the nucleus, mitochondrial matrix, endoplasmic reticulum, chloroplast, apoplast or peroxisome. In another embodiment, the mutated LLO protein contains a signal sequence of a wild-type LLO protein. In another embodiment, the mutated LLO protein lacks a signal peptide. In another embodiment, the mutated LLO protein lacks a signal sequence. In another embodiment, the signal peptide is unaltered with respect to the wild-type LLO protein from which the mutated LLO protein or fragment thereof was derived. In another embodiment, the signal peptide is on N-terminal end of recombinant protein or polypeptide. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the mutated LLO protein or fragment thereof of methods and compositions of the present invention comprises a PEST-like peptide sequence. In another embodiment, the PEST-like peptide sequence is an LLO PEST-like peptide sequence. In another embodiment, the amino acid sequence of the PEST-like peptide sequence is forth in SEQ ID NO: 63. Each possibility represents a separate embodiment of the present invention.

In one embodiment, PEST sequences are sequences that are rich in prolines (P), glutamic acids (E), serines (S) and threonines (T), generally, but not always, flanked by clusters containing several positively charged amino acids, have rapid intracellular half-lives (Rogers et al., 1986, Science 234:364-369). In another embodiment, PEST sequences target the protein to the ubiquitin-proteosome pathway for degradation (Rechsteiner and Rogers TIBS 1996 21:267-271), which in one embodiment, is a pathway also used by eukaryotic cells to generate immunogenic peptides that bind to MHC class I. PEST sequences are abundant among eukaryotic proteins that give rise to immunogenic peptides (Realini et al. FEBS Lett. 1994 348:109-113). Although PEST sequences are usually found in eurkaryotic proteins, a PEST-like sequence rich in the amino acids proline (P), glutamic acid (E), serine (S) and threonine (T) was identified at the amino terminus of the prokaryotic Listeria LLO protein and demonstrated to be essential for L. monocytogenes pathogenicity (Decatur, A. L. and Portnoy, D. A. Science 2000 290:992-995). In one embodiment, the presence of this PEST-like sequence in LLO targets the protein for destruction by proteolytic machinery of the host cell so that once the LLO has served its function and facilitated the escape of L. monocytogenes from the phagolysosomal vacuole, it is destroyed before it damages the cells.

In another embodiment, the immune response to an antigen can be enhanced by fusion of the antigen to a non-hemolytic truncated form of listeriolysin O (ΔLLO). In one embodiment, the observed enhanced cell mediated immunity and anti-tumor immunity of the fusion protein results from the PEST-like sequence present in LLO which targets the antigen for processing.

In another embodiment, the non-LLO peptide that replaces the mutated region of the recombinant protein or polypeptide comprises an antigenic peptide of interest. In another embodiment, the antigenic peptide is a cytotoxic T lymphocyte (CTL) epitope. In another embodiment, the antigenic peptide is a CD4⁺ T cell epitope. In another embodiment, the antigenic peptide is any other type of peptide known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a vaccine comprising an adjuvant and a recombinant protein or polypeptide of the present invention, wherein an antigenic peptide of interest replaces the mutated region. In another embodiment, the present invention provides an immunogenic composition comprising the recombinant protein or polypeptide. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a nucleotide molecule encoding a recombinant protein or polypeptide of the present invention, wherein an antigenic peptide of interest replaces the mutated region.

In another embodiment, a recombinant protein or polypeptide of methods and compositions of the present invention further comprises a heterologous peptide of interest. In another embodiment, the heterologous peptide of interest is fused to the mutated LLO or fragment thereof. In another embodiment, the heterologous peptide of interest is fused to the C-terminal end of the mutated LLO or fragment thereof. In another embodiment, the heterologous peptide of interest is embedded within the mutated LLO or fragment thereof, e.g. at a location other than the mutated region comprising or overlapping the CBD. In another embodiment, the heterologous peptide of interest is inserted into the sequence of the mutated LLO or fragment thereof, e.g. at a location other than the mutated region comprising or overlapping the CBD. In another embodiment, the heterologous peptide of interest is substituted for sequence of the mutated LLO or fragment thereof, e.g. at a location other than the mutated region comprising or overlapping the CBD. Thus, in one embodiment, the recombinant protein or polypeptide of the present invention comprises a mutated LLO or fragment thereof fused or conjugated to an antigenic peptide or protein.

In another embodiment, the present invention provides a vaccine comprising an adjuvant and a recombinant protein or polypeptide of the present invention, wherein the recombinant protein or polypeptide further comprises a heterologous peptide of interest. In another embodiment, the present invention provides an immunogenic composition comprising the recombinant protein or polypeptide. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a nucleotide molecule encoding a recombinant protein or polypeptide of the present invention, wherein the recombinant protein or polypeptide further comprises a heterologous peptide of interest.

In another embodiment, the LLO protein or fragment thereof of methods and compositions of the present invention is on the N-terminal end of a recombinant protein or polypeptide of the present invention. In another embodiment, the LLO protein or fragment thereof is in any other position in the recombinant protein or polypeptide. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a composition comprising a recombinant protein or polypeptide of the present invention and a heterologous peptide of interest. In another embodiment, the present invention provides a composition comprising a recombinant protein or polypeptide of the present invention and a heterologous antigenic peptide of interest. In another embodiment, the recombinant protein or polypeptide is not covalently bound to the heterologous peptide of interest. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a vaccine comprising an adjuvant, a recombinant protein or polypeptide of the present invention, and a heterologous peptide of interest. In another embodiment, the present invention provides a composition comprising an adjuvant, a recombinant protein or polypeptide of the present invention, and a heterologous antigenic peptide of interest. In another embodiment, the recombinant protein or polypeptide is not covalently bound to the heterologous peptide of interest. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a vaccine comprising an adjuvant and a recombinant protein or polypeptide of the present invention. In another embodiment, the present invention provides an immunogenic composition comprising the recombinant protein or polypeptide. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a nucleotide molecule encoding a recombinant protein or polypeptide of the present invention.

In another embodiment, the present invention provides a vaccine comprising a nucleotide molecule of the present invention and an adjuvant.

In another embodiment, the present invention provides a recombinant vaccine vector comprising a nucleotide molecule of the present invention.

In another embodiment, the present invention provides a recombinant vaccine vector encoding a recombinant protein or polypeptide of the present invention.

In another embodiment, the present invention provides a recombinant Listeria strain comprising a recombinant protein or polypeptide of the present invention. In another embodiment, the present invention provides a recombinant Listeria strain expressing a recombinant protein or polypeptide of the present invention. In another embodiment, the present invention provides a recombinant Listeria strain encoding a recombinant protein or polypeptide of the present invention. In another embodiment, the present invention provides a recombinant Listeria strain comprising a recombinant nucleotide encoding a recombinant polypeptide of the present invention. In another embodiment, the Listeria vaccine strain is the species Listeria monocytogenes (LM). Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a cell comprising a vector of the present invention. Methods for producing cells comprising vectors and/or exogenous nucleic acids are well-known in the art. See, for example, Sambrook et al. (1989, Molecular Cloning: A Laboratory Manual, Cold Spring Harbor Laboratory, New York), and in Ausubel et al. (1997, Current Protocols in Molecular Biology, John Wiley & Sons, New York).

In another embodiment, the present invention provides a vaccine comprising a nucleotide molecule of the present invention. In another embodiment, the present invention provides an immunogenic composition comprising the nucleotide molecule. Each possibility represents a separate embodiment of the present invention.

The adjuvant utilized in methods and compositions of the present invention is, in another embodiment, a granulocyte/macrophage colony-stimulating factor (GM-CSF) protein. In another embodiment, the adjuvant comprises a GM-CSF protein. In another embodiment, the adjuvant is a nucleotide molecule encoding GM-CSF. In another embodiment, the adjuvant comprises a nucleotide molecule encoding GM-CSF. In another embodiment, the adjuvant is saponin QS21. In another embodiment, the adjuvant comprises saponin QS21. In another embodiment, the adjuvant is monophosphoryl lipid A. In another embodiment, the adjuvant comprises monophosphoryl lipid A. In another embodiment, the adjuvant is SBAS2. In another embodiment, the adjuvant comprises SBAS2. In another embodiment, the adjuvant is an unmethylated CpG-containing oligonucleotide. In another embodiment, the adjuvant comprises an unmethylated CpG-containing oligonucleotide. In another embodiment, the adjuvant is an immune-stimulating cytokine. In another embodiment, the adjuvant comprises an immune-stimulating cytokine. In another embodiment, the adjuvant is a nucleotide molecule encoding an immune-stimulating cytokine. In another embodiment, the adjuvant comprises a nucleotide molecule encoding an immune-stimulating cytokine. In another embodiment, the adjuvant is or comprises a quill glycoside. In another embodiment, the adjuvant is or comprises a bacterial mitogen. In another embodiment, the adjuvant is or comprises a bacterial toxin. In another embodiment, the adjuvant is or comprises any other adjuvant known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for inducing an immune response in a subject, comprising administering to the subject a recombinant protein or polypeptide of the present invention, wherein the recombinant protein or polypeptide contains an antigenic peptide of interest, thereby inducing an immune response against an antigenic peptide of interest.

In another embodiment, the present invention provides a method for inducing an immune response in a subject, comprising administering to the subject a recombinant protein or polypeptide of the present invention, wherein the recombinant protein or polypeptide contains a heterologous peptide of interest, thereby inducing an immune response against a heterologous peptide of interest.

In another embodiment, the present invention provides a method for inducing an immune response in a subject, comprising administering to the subject a recombinant vaccine vector of the present invention, wherein the recombinant vaccine vector comprises or encodes a recombinant protein or polypeptide that comprises a heterologous antigenic peptide of interest, thereby inducing an immune response against the antigenic peptide of interest.

In another embodiment, the present invention provides a method for inducing an immune response in a subject, comprising administering to the subject a recombinant vaccine vector of the present invention, wherein the recombinant vaccine vector comprises or encodes a recombinant protein or polypeptide that comprises a heterologous peptide of interest, thereby inducing an immune response against the heterologous peptide of interest.

In another embodiment, the present invention provides a method for inducing an immune response in a subject, comprising administering to the subject a recombinant Listeria strain of the present invention, wherein the recombinant Listeria strain comprises or encodes a recombinant protein or polypeptide that comprises a heterologous peptide of interest, thereby inducing an immune response against the heterologous peptide of interest.

In another embodiment, the present invention provides a method for inducing an immune response in a subject, comprising administering to the subject a recombinant Listeria strain of the present invention, wherein the recombinant Listeria strain comprises or encodes a recombinant protein or polypeptide that comprises a heterologous antigenic peptide of interest, thereby inducing an immune response against the heterologous peptide of interest.

In another embodiment of methods and compositions of the present invention, a peptide or nucleotide molecule of the present invention is administered to a subject having a lymphoma, cancer cell, or infectious disease expressing a target antigen of the present invention. In another embodiment, the peptide or nucleotide molecule is administered ex vivo to cells of a subject. In another embodiment, the peptide is administered to a lymphocyte donor; lymphocytes from the donor are then administered, in another embodiment, to a subject. In another embodiment, the peptide is administered to an antibody or lymphocyte donor; antiserum or lymphocytes from the donor is then administered, in another embodiment, to a subject. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the heterologous peptide of interest is a full-length protein, which in one embodiment, comprises an antigenic peptide. In one embodiment, the protein is an NY-ESO-1 protein. In another embodiment, the protein is a Human Papilloma Virus (HPV) E7 protein. In another embodiment, the protein is a B-cell receptor (BCR) protein. In another embodiment, the heterologous peptide of interest is an antigenic peptide.

The antigenic peptide of interest of methods and compositions of the present invention is, in another embodiment, an NY-ESO-1 peptide.

In another embodiment, the present invention provides a recombinant nucleotide molecule encoding an NY-ESO-1-containing peptide of the present invention.

In another embodiment, the present invention provides a composition comprising a mutant-LLO containing recombinant protein or polypeptide of the present invention and an NY-ESO-1 peptide.

In another embodiment, the present invention provides a recombinant vaccine vector encoding an NY-ESO-1-containing peptide of the present invention.

In another embodiment, the present invention provides a recombinant Listeria strain encoding an NY-ESO-1-containing peptide of the present invention.

In one embodiment, NY-ESO-1 is a “cancer-testis” antigen expressed in epithelial ovarian cancer (EOC). In another embodiment, NY-ESO-1 is expressed in metastatic melanoma, breast cancer, lung cancer, esophageal cancer, which in one embodiment, is esophageal squamous cell carcinoma, or a combination thereof. Therefore, in one embodiment, the compositions and methods of the present invention comprising NY-ESO-1 are particularly useful in the prevention or treatment of the above-mentioned cancers.

In another embodiment, the present invention provides a method of producing a recombinant protein or polypeptide of the present invention comprising the step of chemically conjugating a peptide comprising said mutated LLO protein or mutated N-terminal LLO fragment to a peptide comprising said heterologous peptide of interest. In another embodiment, the present invention provides a method of producing a recombinant protein or polypeptide of the present invention comprising the step of translating said recombinant protein or polypeptide from a nucleotide molecule encoding same. In another embodiment, the present invention provides a product made by one or more of the processes described herein.

In another embodiment, the present invention provides a method for inducing an immune response in a subject against an NY-ESO-1-expressing cancer cell, the method comprising the step of administering to the subject an NY-ESO-1 antigen-containing recombinant peptide, protein or polypeptide of the present invention, thereby inducing an immune response against an NY-ESO-1-expressing cancer cell. In another embodiment, the cancer cell is an ovarian melanoma cell. In another embodiment, the cancer cell is a lung cancer cell. In another embodiment, the cancer cell is any other NY-ESO-1-expressing cancer cell known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for treating an NY-ESO-1-expressing tumor in a subject, the method comprising the step of administering to the subject an NY-ESO-1 antigen-containing recombinant peptide, protein or polypeptide of the present invention, thereby treating an NY-ESO-1-expressing tumor in a subject. In another embodiment, the tumor is an ovarian melanoma tumor. In another embodiment, the tumor is a lung cancer tumor. In another embodiment, the tumor is any other NY-ESO-1-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for inhibiting an NY-ESO-1-expressing tumor in a subject, the method comprising the step of administering to the subject an NY-ESO-1 antigen-containing recombinant peptide, protein or polypeptide of the present invention, thereby inhibiting an NY-ESO-1-expressing tumor in a subject. In another embodiment, the tumor is an ovarian melanoma tumor. In another embodiment, the tumor is a lung cancer tumor. In another embodiment, the tumor is any other NY-ESO-1-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for suppressing an NY-ESO-1-expressing tumor in a subject, the method comprising the step of administering to the subject an NY-ESO-1 antigen-containing recombinant peptide, protein or polypeptide of the present invention, thereby supressing an NY-ESO-1-expressing tumor in a subject. In another embodiment, the tumor is an ovarian melanoma tumor. In another embodiment, the tumor is a lung cancer tumor. In another embodiment, the tumor is any other NY-ESO-1-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for inducing regression of an NY-ESO-1-expressing tumor in a subject, the method comprising the step of administering to the subject an NY-ESO-1 antigen-containing recombinant peptide, protein or polypeptide of the present invention, thereby inducing regression of an NY-ESO-1-expressing tumor in a subject. In another embodiment, the tumor is an ovarian melanoma tumor. In another embodiment, the tumor is a lung cancer tumor. In another embodiment, the tumor is any other NY-ESO-1-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for reducing an incidence of an NY-ESO-1-expressing tumor in a subject, the method comprising the step of administering to the subject an NY-ESO-1 antigen-containing recombinant peptide, protein or polypeptide of the present invention, thereby reducing an incidence of an NY-ESO-1-expressing tumor in a subject. In another embodiment, the tumor is an ovarian melanoma tumor. In another embodiment, the tumor is a lung cancer tumor. In another embodiment, the tumor is any other NY-ESO-1-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for protecting a subject against an NY-ESO-1-expressing tumor, the method comprising the step of administering to the subject an NY-ESO-1 antigen-containing recombinant peptide, protein or polypeptide of the present invention, thereby protecting a subject against an NY-ESO-1-expressing tumor. In another embodiment, the tumor is an ovarian melanoma tumor. In another embodiment, the tumor is a lung cancer tumor. In another embodiment, the tumor is any other NY-ESO-1-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for inducing an immune response in a subject against an NY-ESO-1-expressing cancer cell, the method comprising the step of administering to the subject an NY-ESO-1 antigen-expressing vaccine vector of the present invention, thereby inducing an immune response against an NY-ESO-1-expressing cancer cell. In another embodiment, the cancer cell is an ovarian melanoma cell. In another embodiment, the cancer cell is a lung cancer cell. In another embodiment, the cancer cell is any other NY-ESO-1-expressing cancer cell known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for treating or reducing an incidence of an NY-ESO-1-expressing tumor in a subject, the method comprising the step of administering to the subject an NY-ESO-1 antigen-expressing vaccine vector of the present invention, thereby treating or reducing an incidence of an NY-ESO-1-expressing tumor in a subject. In another embodiment, the tumor is an ovarian melanoma tumor. In another embodiment, the tumor is a lung cancer tumor. In another embodiment, the tumor is any other NY-ESO-1-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for inducing regression of an NY-ESO-1-expressing tumor in a subject, the method comprising the step of administering to the subject an NY-ESO-1 antigen-expressing vaccine vector of the present invention, thereby inducing regression of an NY-ESO-1-expressing tumor in a subject. In another embodiment, the tumor is an ovarian melanoma tumor. In another embodiment, the tumor is a lung cancer tumor. In another embodiment, the tumor is any other NY-ESO-1-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for protecting a subject against an NY-ESO-1-expressing tumor, the method comprising the step of administering to the subject an NY-ESO-1 antigen-expressing vaccine vector of the present invention, thereby protecting a subject against an NY-ESO-1-expressing tumor. In another embodiment, the tumor is an ovarian melanoma tumor. In another embodiment, the tumor is a lung cancer tumor. In another embodiment, the tumor is any other NY-ESO-1-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for inducing an immune response in a subject against an NY-ESO-1-expressing cancer cell, the method comprising the step of administering to the subject an NY-ESO-1 antigen-encoding nucleotide molecule of the present invention, thereby inducing an immune response against an NY-ESO-1-expressing cancer cell. In another embodiment, the cancer cell is an ovarian melanoma cell. In another embodiment, the cancer cell is a lung cancer cell. In another embodiment, the cancer cell is any other NY-ESO-1-expressing cancer cell known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for treating or reducing an incidence of an NY-ESO-1-expressing tumor in a subject, the method comprising the step of administering to the subject an NY-ESO-1 antigen-encoding nucleotide molecule of the present invention, thereby treating or reducing an incidence of an NY-ESO-1-expressing tumor in a subject. In another embodiment, the tumor is an ovarian melanoma tumor. In another embodiment, the tumor is a lung cancer tumor. In another embodiment, the tumor is any other NY-ESO-1-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for inhibiting an NY-ESO-1-expressing tumor in a subject, the method comprising the step of administering to the subject an NY-ESO-1 antigen-encoding nucleotide molecule of the present invention, thereby inhibiting an NY-ESO-1-expressing tumor in a subject. In another embodiment, the tumor is an ovarian melanoma tumor. In another embodiment, the tumor is a lung cancer tumor. In another embodiment, the tumor is any other NY-ESO-1-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for suppressing an NY-ESO-1-expressing tumor in a subject, the method comprising the step of administering to the subject an NY-ESO-1 antigen-encoding nucleotide molecule of the present invention, thereby inhibiting an NY-ESO-1-expressing tumor in a subject. In another embodiment, the tumor is an ovarian melanoma tumor. In another embodiment, the tumor is a lung cancer tumor. In another embodiment, the tumor is any other NY-ESO-1-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for inducing regression of an NY-ESO-1-expressing tumor in a subject, the method comprising the step of administering to the subject an NY-ESO-1 antigen-encoding nucleotide molecule of the present invention, thereby inducing regression of an NY-ESO-1-expressing tumor in a subject. In another embodiment, the tumor is an ovarian melanoma tumor. In another embodiment, the tumor is a lung cancer tumor. In another embodiment, the tumor is any other NY-ESO-1-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for protecting a subject against an NY-ESO-1-expressing tumor, the method comprising the step of administering to the subject an NY-ESO-1 antigen-encoding nucleotide molecule of the present invention, thereby protecting a subject against an NY-ESO-1-expressing tumor. In another embodiment, the tumor is an ovarian melanoma tumor. In another embodiment, the tumor is a lung cancer tumor. In another embodiment, the tumor is any other NY-ESO-1-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for inducing an immune response in a subject against an NY-ESO-1-expressing cancer cell, the method comprising the step of administering to the subject an NY-ESO-1 antigen-expressing recombinant Listeria strain of the present invention, thereby inducing an immune response against an NY-ESO-1-expressing cancer cell. In another embodiment, the cancer cell is an ovarian melanoma cell. In another embodiment, the cancer cell is a lung cancer cell. In another embodiment, the cancer cell is any other NY-ESO-1-expressing cancer cell known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for treating or reducing an incidence of an NY-ESO-1-expressing tumor in a subject, the method comprising the step of administering to the subject an NY-ESO-1 antigen-expressing recombinant Listeria strain of the present invention, thereby treating or reducing an incidence of an NY-ESO-1-expressing tumor in a subject. In another embodiment, the tumor is an ovarian melanoma tumor. In another embodiment, the tumor is a lung cancer tumor. In another embodiment, the tumor is any other NY-ESO-1-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for inhibiting an NY-ESO-1-expressing tumor in a subject, the method comprising the step of administering to the subject an NY-ESO-1 antigen-expressing recombinant Listeria strain of the present invention, thereby treating or reducing an incidence of an NY-ESO-1-expressing tumor in a subject. In another embodiment, the tumor is an ovarian melanoma tumor. In another embodiment, the tumor is a lung cancer tumor. In another embodiment, the tumor is any other NY-ESO-1-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for suppressing an NY-ESO-1-expressing tumor in a subject, the method comprising the step of administering to the subject an NY-ESO-1 antigen-expressing recombinant Listeria strain of the present invention, thereby treating or reducing an incidence of an NY-ESO-1-expressing tumor in a subject. In another embodiment, the tumor is an ovarian melanoma tumor. In another embodiment, the tumor is a lung cancer tumor. In another embodiment, the tumor is any other NY-ESO-1-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for inducing regression of an NY-ESO-1-expressing tumor in a subject, the method comprising the step of administering to the subject an NY-ESO-1 antigen-expressing recombinant Listeria strain of the present invention, thereby inducing regression of an NY-ESO-1-expressing tumor in a subject. In another embodiment, the tumor is an ovarian melanoma tumor. In another embodiment, the tumor is a lung cancer tumor. In another embodiment, the tumor is any other NY-ESO-1-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for protecting a subject against an NY-ESO-1-expressing tumor, the method comprising the step of administering to the subject an NY-ESO-1 antigen-expressing recombinant Listeria strain of the present invention, thereby protecting a subject against an NY-ESO-1-expressing tumor. In another embodiment, the tumor is an ovarian melanoma tumor. In another embodiment, the tumor is a lung cancer tumor. In another embodiment, the tumor is any other NY-ESO-1-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for inducing an immune response against an NY-ESO-1 epitope, comprising the step of administering to the subject an NY-ESO-1 antigen-containing recombinant peptide, protein or polypeptide of the present invention, thereby inducing an immune response against an NY-ESO-1 epitope.

In another embodiment, the present invention provides a method for inducing an immune response against an NY-ESO-1 antigen, comprising the step of administering to the subject a recombinant peptide, protein or polypeptide of the present invention containing said NY-ESO-1 antigen, thereby inducing an immune response against an NY-ESO-1 epitope.

In one embodiment, a NY-ESO-1 epitope for use in the compositions and methods of the present invention is ASGPGGGAPR: 53-62 (A31), ARGPESRLL: 80-88 (Cw6), LAMPFATPM: 92-100 (Cw3), MPFATPMEA: 94-102 (B35, B51), TVSGNILTR: 127-136 (A68), TVSGNILT: 127-135 (Cw15), SLLMWITQC: 157-165 (A2; Example 6), or another NY-ESO-1 epitope known in the art.

In another embodiment, the present invention provides a method for inducing an immune response against an NY-ESO-1-expressing target cell, comprising the step of administering to the subject an NY-ESO-1 antigen-containing recombinant peptide, protein or polypeptide of the present invention, thereby inducing an immune response against an NY-ESO-1-expressing target cell. In another embodiment, the target cell is an ovarian melanoma cell. In another embodiment, the target cell is a lung cancer cell. In another embodiment, the target cell is any other NY-ESO-1-expressing cell known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the target NY-ESO-1-expressing cancer cell or tumor of methods and compositions of the present invention is a non-small cell lung cancer (NSCLC) cell or tumor. In another embodiment, the NY-ESO-1-expressing cancer cell is a lung adenocarcinoma cell or tumor. In another embodiment, the NY-ESO-1-expressing cancer cell is a bronchioloalveolar carcinoma (BAC) cell or tumor. In another embodiment, the NY-ESO-1-expressing cancer cell is a cell or tumor from an adenocarcinoma with bronchioloalveolar features (AdenoBAC). In another embodiment, the NY-ESO-1-expressing cancer cell or tumor is from a squamous cell carcinoma of the lung. Each possibility represents a separate embodiment of the present invention.

The NY-ESO-1 peptide of methods and compositions of the present invention is, in another embodiment, a peptide from an NY-ESO-1 protein, wherein the sequence of the protein is:

MQAEGRGTGGSTGDADGPGGPGIPDGPGGNAGGPGEAGATGGRGPRGAGAA RASGPGGGAPRGPHGGAASGLNGCCRCGARGPESRLLEFYLAMPFATPMEAELARR SLAQDAPPLPVPGVLLKEFTVSGNILTIRLTAADHRQLQLSISSCLQQLSLLMWITQCF LPVFLAQPPSGQRR (SEQ ID NO: 1; GenBank Accession No. NM_001327). In another embodiment, the NY-ESO-1 protein is a homologue of SEQ ID NO: 1. In another embodiment, the NY-ESO-1 protein is a variant of SEQ ID NO: 1. In another embodiment, the NY-ESO-1 protein is an isomer of SEQ ID NO: 1. In another embodiment, the NY-ESO-1 protein is a fragment of SEQ ID NO: 1. In another embodiment, the NY-ESO-1 protein is a fragment of a homologue of SEQ ID NO: 1. In another embodiment, the NY-ESO-1 protein is a fragment of a variant of SEQ ID NO: 1. In another embodiment, the NY-ESO-1 protein is a fragment of an isomer of SEQ ID NO: 1. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the NY-ESO-1 peptide of methods and compositions of the present invention is derived from any other NY-ESO-1 protein known in the art. Each possibility represents another embodiment of the present invention. In another embodiment, the NY-ESO-1 antigen is a peptide having the sequence: SLLMWITQC (SEQ ID NO: 2). In another embodiment, the sequence is SLLMWITQCFL (SEQ ID NO: 3). In another embodiment, the sequence is SLLMWITQCFLP (SEQ ID NO: 4). In another embodiment, the sequence is SLLMWITQCFLPV (SEQ ID NO: 5). In another embodiment, the sequence is SLLMWITQCFLPVF (SEQ ID NO: 6). In another embodiment, the sequence is SLLMWITQCFLPVFL (SEQ ID NO: 7). In another embodiment, the sequence is WITQCFLPVFLAQPPSGQRR (SEQ ID NO: 8). In another embodiment, the sequence is YLAMPFATPMEAELARRSLA (SEQ ID NO: 9). In another embodiment, the sequence is ASGPGGGAPR (SEQ ID NO: 10). In another embodiment, the sequence is MPFATPMEA (SEQ ID NO: 11). In another embodiment, the sequence is LAMPFATPM (SEQ ID NO: 12). In another embodiment, the sequence is ARGPESRLL (SEQ ID NO: 13). In another embodiment, the sequence is LLMWITQCF (SEQ ID NO: 14). In another embodiment, the sequence is SLLMWITQV (SEQ ID NO: 15). In one embodiment, the NY-ESO-1 antigen is a peptide comprising positions 157-165 of the wild-type the NY-ESO-1 peptide. In another embodiment, the NY-ESO-1 antigen is a peptide comprising positions 53-62 of the wild-type the NY-ESO-1 peptide. In another embodiment, the NY-ESO-1 antigen is a peptide comprising positions 94-102 of the wild-type the NY-ESO-1 peptide. In another embodiment, the NY-ESO-1 antigen is a peptide comprising positions 92-100 of the wild-type the NY-ESO-1 peptide. In another embodiment, the NY-ESO-1 antigen is a peptide comprising positions 80-88 of the wild-type the NY-ESO-1 peptide. In another embodiment, the NY-ESO-1 antigen is a peptide comprising positions 158-166 of the wild-type the NY-ESO-1 peptide. In another embodiment, the NY-ESO-1 antigen is a variant of a wild-type NY-ESO-1 peptide. An example of a variant is SLLMWITQV (SEQ ID NO: 16). Each possibility represents another embodiment of the present invention.

In another embodiment, the antigenic peptide of interest of methods and compositions of the present invention is a Human Papilloma Virus (HPV) E7 peptide. In another embodiment, the antigenic peptide is a whole E7 protein. In another embodiment, the antigenic peptide is a fragment of an E7 protein. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a recombinant nucleotide molecule encoding an E7-containing peptide of the present invention.

In another embodiment, the present invention provides a composition comprising a mutant-LLO containing recombinant peptide, protein or polypeptide of the present invention and an E7 peptide.

In another embodiment, the present invention provides a recombinant vaccine vector encoding an E7-containing peptide of the present invention.

In another embodiment, the present invention provides a recombinant Listeria strain encoding an E7-containing peptide of the present invention.

In another embodiment, the present invention provides a method for inducing an immune response in a subject against an HPV E7 epitope, the method comprising the step of administering to the subject the recombinant peptide, protein or polypeptide of the present invention, thereby inducing an immune response against an HPV E7 epitope.

In one embodiment, an HPV E7 epitope for use in the compositions and methods of the present invention is TLHEYMLDL: 7-15 (B8), YMLDLQPETT: 11-20 (A2), LLMGTLGIV: 82-90 (A2), TLGIVCPI: 86-93 (A2), or another HPV E7 epitope known in the art.

In another embodiment, the present invention provides a method for inducing an immune response in a subject against an HPV E7 antigen, the method comprising the step of administering to the subject an HPV-E7 containing recombinant peptide, protein or polypeptide of the present invention, thereby inducing an immune response against an HPV E7 antigen.

In another embodiment, the present invention provides a method for inducing an immune response in a subject against an HPV E7-expressing target cell, the method comprising the step of administering to the subject an HPV-E7 containing recombinant peptide, protein or polypeptide of the present invention, thereby inducing an immune response against an HPV E7-expressing target cell. In another embodiment, the target cell is a cervical cancer cell. In another embodiment, the target cell is a head-and-neck cancer cell. In another embodiment, the target cell is any other type of HPV E7-expressing cell known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for treating an HPV E7-expressing tumor in a subject, the method comprising the step of administering to the subject an HPV-E7 containing recombinant peptide, protein or polypeptide of the present invention, thereby treating an HPV E7-expressing tumor in a subject. In another embodiment, the tumor is a cervical tumor. In another embodiment, the tumor is a head-and-neck tumor. In another embodiment, the tumor is any other type of HPV E7-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for inhibiting or suppressing an HPV E7-expressing tumor in a subject, the method comprising the step of administering to the subject an HPV-E7 containing recombinant peptide, protein or polypeptide of the present invention, thereby inhibiting or suppressing an HPV E7-expressing tumor in a subject. In another embodiment, the tumor is a cervical tumor. In another embodiment, the tumor is a head-and-neck tumor. In another embodiment, the tumor is any other type of HPV E7-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for inducing regression of an HPV E7-expressing tumor in a subject, the method comprising the step of administering to the subject an HPV-E7 containing recombinant peptide, protein or polypeptide of the present invention, thereby inducing regression of an HPV E7-expressing tumor in a subject. In another embodiment, the tumor is a cervical tumor. In another embodiment, the tumor is a head-and-neck tumor. In another embodiment, the tumor is any other type of HPV E7-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for reducing an incidence of an HPV E7-expressing tumor in a subject, the method comprising the step of administering to the subject an HPV-E7 containing recombinant peptide, protein or polypeptide of the present invention, thereby reducing an incidence of an HPV E7-expressing tumor in a subject. In another embodiment, the tumor is a cervical tumor. In another embodiment, the tumor is a head-and-neck tumor. In another embodiment, the tumor is any other type of HPV E7-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for protecting a subject against an HPV E7-expressing tumor in a subject, the method comprising the step of administering to the subject an HPV-E7 containing recombinant peptide, protein or polypeptide of the present invention, thereby protecting a subject against an HPV E7-expressing tumor in a subject. In another embodiment, the tumor is a cervical tumor. In another embodiment, the tumor is a head-and-neck tumor. In another embodiment, the tumor is any other type of HPV E7-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for inducing an immune response in a subject against an HPV E7-expressing target cell, the method comprising the step of administering to the subject a vaccine vector encoding an HPV E7-containing recombinant peptide, protein or polypeptide of the present invention, thereby inducing an immune response against an HPV E7-expressing target cell. In another embodiment, the target cell is a cervical cancer cell. In another embodiment, the target cell is a head-and-neck cancer cell. In another embodiment, the target cell is any other type of HPV E7-expressing cell known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for treating or reducing an incidence of an HPV E7-expressing tumor in a subject, the method comprising the step of administering to the subject an HPV-E7 encoding vaccine vector of the present invention, thereby treating or reducing an incidence of an HPV E7-expressing tumor in a subject. In another embodiment, the tumor is a cervical tumor. In another embodiment, the tumor is a head-and-neck tumor. In another embodiment, the tumor is any other type of HPV E7-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for inhibiting or suppressing an HPV E7-expressing tumor in a subject, the method comprising the step of administering to the subject an HPV-E7 encoding vaccine vector of the present invention, thereby inhibiting or suppressing an HPV E7-expressing tumor in a subject. In another embodiment, the tumor is a cervical tumor. In another embodiment, the tumor is a head-and-neck tumor. In another embodiment, the tumor is any other type of HPV E7-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for inducing regression of an HPV E7-expressing tumor in a subject, the method comprising the step of administering to the subject an HPV-E7 encoding vaccine vector of the present invention, thereby inducing regression of an HPV E7-expressing tumor in a subject. In another embodiment, the tumor is a cervical tumor. In another embodiment, the tumor is a head-and-neck tumor. In another embodiment, the tumor is any other type of HPV E7-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for protecting a subject against an HPV E7-expressing tumor in a subject, the method comprising the step of administering to the subject an HPV-E7 encoding vaccine vector of the present invention, thereby protecting a subject against an HPV E7-expressing tumor in a subject. In another embodiment, the tumor is a cervical tumor. In another embodiment, the tumor is a head-and-neck tumor. In another embodiment, the tumor is any other type of HPV E7-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for inducing an immune response in a subject against an HPV E7-expressing target cell, the method comprising the step of administering to the subject an HPV-E7 encoding nucleotide molecule of the present invention, thereby inducing an immune response against an HPV E7-expressing target cell. In another embodiment, the target cell is a cervical cancer cell. In another embodiment, the target cell is a head-and-neck cancer cell. In another embodiment, the target cell is any other type of HPV E7-expressing cell known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for treating or reducing an incidence of an HPV E7-expressing tumor in a subject, the method comprising the step of administering to the subject an HPV-E7 encoding nucleotide molecule of the present invention, thereby treating or reducing an incidence of an HPV E7-expressing tumor in a subject. In another embodiment, the tumor is a cervical tumor. In another embodiment, the tumor is a head-and-neck tumor. In another embodiment, the tumor is any other type of HPV E7-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for inhibiting or suppressing an HPV E7-expressing tumor in a subject, the method comprising the step of administering to the subject an HPV-E7 encoding nucleotide molecule of the present invention, thereby inhibiting or suppressing an HPV E7-expressing tumor in a subject. In another embodiment, the tumor is a cervical tumor. In another embodiment, the tumor is a head-and-neck tumor. In another embodiment, the tumor is any other type of HPV E7-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for inducing regression of an HPV E7-expressing tumor in a subject, the method comprising the step of administering to the subject an HPV-E7 encoding nucleotide molecule of the present invention, thereby inducing regression of an HPV E7-expressing tumor in a subject. In another embodiment, the tumor is a cervical tumor. In another embodiment, the tumor is a head-and-neck tumor. In another embodiment, the tumor is any other type of HPV E7-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for protecting a subject against an HPV E7-expressing tumor in a subject, the method comprising the step of administering to the subject an HPV-E7 encoding nucleotide molecule of the present invention, thereby protecting a subject against an HPV E7-expressing tumor in a subject. In another embodiment, the tumor is a cervical tumor. In another embodiment, the tumor is a head-and-neck tumor. In another embodiment, the tumor is any other type of HPV E7-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for inducing an immune response in a subject against an HPV E7-expressing target cell, the method comprising the step of administering to the subject an a Listeria strain encoding an HPV-E7-containing peptide of the present invention, thereby inducing an immune response against an HPV E7-expressing target cell. In another embodiment, the target cell is a cervical cancer cell. In another embodiment, the target cell is a head-and-neck cancer cell. In another embodiment, the target cell is any other type of HPV E7-expressing cell known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for treating or reducing an incidence of an HPV E7-expressing tumor in a subject, the method comprising the step of administering to the subject an HPV-E7 encoding Listeria strain of the present invention, thereby treating or reducing an incidence of an HPV E7-expressing tumor in a subject. In another embodiment, the tumor is a cervical tumor. In another embodiment, the tumor is a head-and-neck tumor. In another embodiment, the tumor is any other type of HPV E7-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for inhibiting or suppressing an HPV E7-expressing tumor in a subject, the method comprising the step of administering to the subject an HPV-E7 encoding Listeria strain of the present invention, thereby inhibiting or suppressing an HPV E7-expressing tumor in a subject. In another embodiment, the tumor is a cervical tumor. In another embodiment, the tumor is a head-and-neck tumor. In another embodiment, the tumor is any other type of HPV E7-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for inducing regression of an HPV E7-expressing tumor in a subject, the method comprising the step of administering to the subject an HPV-E7 encoding Listeria strain of the present invention, thereby inducing regression of an HPV E7-expressing tumor in a subject. In another embodiment, the tumor is a cervical tumor. In another embodiment, the tumor is a head-and-neck tumor. In another embodiment, the tumor is any other type of HPV E7-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for protecting a subject against an HPV E7-expressing tumor in a subject, the method comprising the step of administering to the subject an HPV-E7 encoding Listeria strain of the present invention, thereby protecting a subject against an HPV E7-expressing tumor in a subject. In another embodiment, the tumor is a cervical tumor. In another embodiment, the tumor is a head-and-neck tumor. In another embodiment, the tumor is any other type of HPV E7-expressing tumor known in the art. Each possibility represents a separate embodiment of the present invention.

The cervical tumor targeted by methods of the present invention is, in another embodiment, a squamous cell carcinoma. In another embodiment, the cervical tumor is an adenocarcinoma. In another embodiment, the cervical tumor is an adenosquamous carcinoma. In another embodiment, the cervical tumor is a small cell carcinoma. In another embodiment, the cervical tumor is any other type of cervical tumor known in the art. Each possibility represents a separate embodiment of the present invention.

In one embodiment, the tumor targeted by methods of the present invention is a head and neck carcinoma. In another embodiment, the tumor is an anal carcinoma. In another embodiment, the tumor is a vulvar carcinoma. In another embodiment, the tumor is a vaginal carcinoma. Each possibility represents a separate embodiment of the present invention.

In one embodiment, the methods provided herein may be used in conjunction with other methods of treating, inhibiting, or suppressing cervical cancer, including, inter alia, surgery, radiation therapy, chemotherapy, surveillance, adjuvant (additional), or a combination of these treatments.

In another embodiment, the methods provided herein may be used in conjunction with other methods of treating, inhibiting, or suppressing head and neck carcinoma, including, inter alia, surgery, radiation therapy, chemotherapy, surveillance, adjuvant (additional), or a combination of these treatments.

In another embodiment, the methods provided herein may be used in conjunction with other methods of treating, inhibiting, or suppressing anal carcinoma, including, inter alia, surgery, radiation therapy, chemotherapy, surveillance, adjuvant (additional), or a combination of these treatments.

In another embodiment, the methods provided herein may be used in conjunction with other methods of treating, inhibiting, or suppressing vulvar carcinoma, including, inter alia, surgery, radiation therapy, chemotherapy, surveillance, adjuvant (additional), or a combination of these treatments.

In another embodiment, the methods provided herein may be used in conjunction with other methods of treating, inhibiting, or suppressing vaginal carcinoma, including, inter alia, surgery, radiation therapy, chemotherapy, surveillance, adjuvant (additional), or a combination of these treatments.

The E7 protein that is utilized (either whole or as the source of the fragments) has, in another embodiment, the sequence

MHGDTPTLHEYMLDLQPETTDLYCYEQLNDSSEEEDEIDGPAGQAEPDRAHY NIVTFCCKCDSTLRLCVQSTHVDIRTLEDLLMGTLGIVCPICSQKP (SEQ ID NO: 17). In another embodiment, the E7 protein is a homologue of SEQ ID NO: 17. In another embodiment, the E7 protein is a variant of SEQ ID NO: 17. In another embodiment, the E7 protein is an isomer of SEQ ID NO: 17. In another embodiment, the E7 protein is a fragment of SEQ ID NO: 17. In another embodiment, the E7 protein is a fragment of a homologue of SEQ ID NO: 17. In another embodiment, the E7 protein is a fragment of a variant of SEQ ID NO: 17. In another embodiment, the E7 protein is a fragment of an isomer of SEQ ID NO: 17. Each possibility represents a separate embodiment of the present invention.

In one embodiment, the cholesterol binding domain of LLO (ECTGLAWEWWR; SEQ ID NO: 18) is substituted with an E7 epitope (RAHYNIVTF; SEQ ID NO: 19).

In another embodiment, the sequence of the E7 protein is:

MHGPKATLQDIVLHLEPQNEIPVDLLCHEQLSDSEEENDEIDGVNHQHLPARR AEPQRHTMLCMCCKCEARIELVVESSADDLRAFQQLFLNTLSFVCPWCASQQ (SEQ ID NO: 20). In another embodiment, the E7 protein is a homologue of SEQ ID NO: 20. In another embodiment, the E7 protein is a variant of SEQ ID NO: 20. In another embodiment, the E7 protein is an isomer of SEQ ID NO: 20. In another embodiment, the E7 protein is a fragment of SEQ ID NO: 20. In another embodiment, the E7 protein is a fragment of a homologue of SEQ ID NO: 20. In another embodiment, the E7 protein is a fragment of a variant of SEQ ID NO: 20. In another embodiment, the E7 protein is a fragment of an isomer of SEQ ID NO: 20. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the E7 protein has a sequence set forth in one of the following GenBank entries: M24215, NC_004500, V01116, X62843, or M14119. In another embodiment, the E7 protein is a homologue of a sequence from one of the above GenBank entries. In another embodiment, the E7 protein is a variant of a sequence from one of the above GenBank entries. In another embodiment, the E7 protein is an isomer of a sequence from one of the above GenBank entries. In another embodiment, the E7 protein is a fragment of a sequence from one of the above GenBank entries. In another embodiment, the E7 protein is a fragment of a homologue of a sequence from one of the above GenBank entries. In another embodiment, the E7 protein is a fragment of a variant of a sequence from one of the above GenBank entries. In another embodiment, the E7 protein is a fragment of an isomer of a sequence from one of the above GenBank entries. Each possibility represents a separate embodiment of the present invention.

In one embodiment, the HPV16 E7 antigen is a peptide having the sequence: TLGIVCPI (SEQ ID NO: 21). In another embodiment, the HPV16 E7 antigen is a peptide having the sequence: LLMGTLGIV (SEQ ID NO: 22). In another embodiment, the HPV16 E7 antigen is a peptide having the sequence: YMLDLQPETT (SEQ ID NO: 23). In one embodiment, the HPV16 E7 antigen is a peptide comprising positions 86-93 of the wild-type HPV16 E7 antigen. In one embodiment, the HPV16 E7 antigen is a peptide comprising positions 82-90 of the wild-type HPV16 E7 antigen. In one embodiment, the HPV16 E7 antigen is a peptide comprising positions 11-20 of the wild-type HPV16 E7 antigen. In another embodiment, the HPV16 E7 antigen is a peptide consisting of positions 86-93, 82-90, or 11-20 of the wild-type HPV 16 E7 antigen. In another embodiment, the HPV 16 E7 antigen is a variant of a wild-type HPV16 E7 peptide. In another embodiment, the HPV16 E7 antigen is any HPV16 E7 antigen described in Ressing at al., J Immunol 1995 154(11):5934-43, which is incorporated herein by reference in its entirety.

Each possibility represents another embodiment of the present invention.

In another embodiment, the antigenic peptide of interest of methods and compositions of the present invention is an HPV E6 peptide. In another embodiment, the antigenic peptide is a whole E6 protein. In another embodiment, the antigenic peptide is a fragment of an E6 protein. Each possibility represents a separate embodiment of the present invention.

The E6 protein that is utilized (either whole or as the source of the fragments) has, in another embodiment, the sequence

MHQKRTAMFQDPQERPRKLPQLCTELQTTIHDIILECVYCKQQLLRREVYDFA FRDLCIVYRDGNPYAVCDKCLKFYSKISEYRHYCYSLYGTTLEQQYNKPLCDLLIRCI NCQKPLCPEEKQRHLDKKQRFHNIRGRWTGRCMSCCRSSRTRRETQL (SEQ ID NO: 24). In another embodiment, the E6 protein is a homologue of SEQ ID NO: 24. In another embodiment, the E6 protein is a variant of SEQ ID NO: 24. In another embodiment, the E6 protein is an isomer of SEQ ID NO: 24. In another embodiment, the E6 protein is a fragment of SEQ ID NO: 24. In another embodiment, the E6 protein is a fragment of a homologue of SEQ ID NO: 24. In another embodiment, the E6 protein is a fragment of a variant of SEQ ID NO: 24. In another embodiment, the E6 protein is a fragment of an isomer of SEQ ID NO: 24. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the sequence of the E6 protein is:

MARFEDPTRRPYKLPDLCTELNTSLQDIEITCVYCKTVLELTEVFEFAFKDLFV VYRDSIPHAACHKClDFYSRIRELRHYSDSVYGDTLEKLTNTGLYNLLIRCLRCQKPL NPAEKLRHLNEKRRFHNIAGHYRGQCHSCCNRARQERLQRRRETQV (SEQ ID NO: 25). In another embodiment, In another embodiment, the E6 protein is a homologue of SEQ ID NO: 25. In another embodiment, the E6 protein is a variant of SEQ ID NO: 25. In another embodiment, the E6 protein is an isomer of SEQ ID NO: 25. In another embodiment, the E6 protein is a fragment of SEQ ID NO: 25. In another embodiment, the E6 protein is a fragment of a homologue of SEQ ID NO: 25. In another embodiment, the E6 protein is a fragment of a variant of SEQ ID NO: 25. In another embodiment, the E6 protein is a fragment of an isomer of SEQ ID NO: 25. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the E6 protein has a sequence set forth in one of the following GenBank entries: M24215, M14119, NC_004500, V01116, X62843, or M14119. In another embodiment, the E6 protein is a homologue of a sequence from one of the above GenBank entries. In another embodiment, the E6 protein is a variant of a sequence from one of the above GenBank entries. In another embodiment, the E6 protein is an isomer of a sequence from one of the above GenBank entries. In another embodiment, the E6 protein is a fragment of a sequence from one of the above GenBank entries. In another embodiment, the E6 protein is a fragment of a homologue of a sequence from one of the above GenBank entries. In another embodiment, the E6 protein is a fragment of a variant of a sequence from one of the above GenBank entries. In another embodiment, the E6 protein is a fragment of an isomer of a sequence from one of the above GenBank entries. Each possibility represents a separate embodiment of the present invention.

The HPV that is the source of the heterologous antigen of methods of the present invention is, in another embodiment, an HPV 16. In another embodiment, the HPV is an HPV-18. In another embodiment, the HPV is selected from HPV-16 and HPV-18. In another embodiment, the HPV is an HPV-31. In another embodiment, the HPV is an HPV-35. In another embodiment, the HPV is an HPV-39. In another embodiment, the HPV is an HPV-45. In another embodiment, the HPV is an HPV-51. In another embodiment, the HPV is an HPV-52. In another embodiment, the HPV is an HPV-58. In another embodiment, the HPV is a high-risk HPV type. In another embodiment, the HPV is a mucosal HPV type. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the antigenic peptide of interest of methods and compositions of the present invention is a BCR idiotype.

Cytogenetic studies have shown that some histological and immunological sub-types of NHL have chromosomal abnormalities with reciprocal translocations, frequently involving genes for the B-cell receptor and an oncogene. Lymphomagenesis results in clonal expansion of the transformed B-cell, with each daughter cell expressing the BCR on the cell surface as well as BCR-derived peptides associated with MHC class I and II molecules. The BCR has a unique conformation formed by the hypervariable regions of the heavy and light chain, this is referred to as the “idiotype,” is the same for every daughter cell within the tumor, and is not present on significant numbers of normal cells. Therefore, the idiotype is a specific tumor antigen and a target for lymphoma therapy.

As provided herein, the present invention has produced a conformationally intact fusion protein comprising an LLO protein and a BCR idiotype (Experimental Details section herein).

In another embodiment, the present invention provides a method for inducing an immune response against a lymphoma in a subject, comprising the step of administering to the subject a BCR idiotype-containing recombinant peptide, protein or polypeptide of the present invention, thereby inducing an immune response against a lymphoma.

In another embodiment, the present invention provides a method for inducing an immune response against a lymphoma in a subject, comprising the step of administering to the subject a BCR idiotype-encoding nucleotide molecule of the present invention, thereby inducing an immune response against a lymphoma.

In another embodiment, the present invention provides a method for inducing an immune response against a lymphoma in a subject, comprising the step of administering to the subject a BCR idiotype-expressing recombinant vaccine vector of the present invention, thereby inducing an immune response against a lymphoma.

In another embodiment, the present invention provides a method for inducing an immune response against a lymphoma in a subject, comprising the step of administering to the subject a BCR idiotype-expressing Listeria strain of the present invention, thereby inducing an immune response against a lymphoma.

In another embodiment, the present invention provides a method for treating, inhibiting, or suppressing a lymphoma in a subject, comprising the step of administering to the subject a BCR idiotype-containing peptide of the present invention, thereby treating a lymphoma.

In another embodiment, the present invention provides a method for treating, inhibiting, or suppressing a lymphoma in a subject, comprising the step of administering to the subject a BCR idiotype-encoding nucleotide molecule of the present invention, thereby treating a lymphoma.

In another embodiment, the present invention provides a method for treating, inhibiting, or suppressing a lymphoma in a subject, comprising the step of administering to the subject a BCR idiotype-expressing recombinant vaccine vector of the present invention, thereby treating a lymphoma in a subject.

In another embodiment, the present invention provides a method for treating, inhibiting, or suppressing a lymphoma in a subject, comprising the step of administering to the subject a BCR idiotype-expressing Listeria strain of the present invention, thereby treating a lymphoma in a subject.

In another embodiment, the present invention provides a method for inducing a regression of a lymphoma in a subject, comprising the step of administering to the subject a BCR idiotype-containing peptide of the present invention, thereby inducing a regression of a lymphoma.

In another embodiment, the present invention provides a method for inducing a regression of a lymphoma in a subject, comprising the step of administering to the subject a BCR idiotype-encoding nucleotide molecule of the present invention, thereby inducing a regression of a lymphoma.

In another embodiment, the present invention provides a method for inducing a regression of a lymphoma in a subject, comprising the step of administering to the subject a BCR idiotype-expressing recombinant vaccine vector of the present invention, thereby inducing a regression of a lymphoma in a subject.

In another embodiment, the present invention provides a method for inducing a regression of a lymphoma in a subject, comprising the step of administering to the subject a BCR idiotype-expressing Listeria strain of the present invention, thereby inducing a regression of a lymphoma in a subject.

As provided in the Experimental Details section herein, fusion of LLO to an antigen increases its immunogenicity. In addition, administration of fusion proteins of the present invention results in protection against tumor challenge.

Moreover, as provided herein, the present invention has produced a conformationally intact fusion protein comprising an LLO protein and a BCR idiotype, has demonstrated accurate and effective methodologies for testing anti-lymphoma vaccines in mouse and animal models, and has shown the efficacy of vaccines of the present invention in protecting against lymphoma and their superiority over currently accepted anti-lymphoma vaccines (Experimental Details section).

In one embodiment, a vaccine of the present invention is a composition that upon administration stimulates antibody production or cellular immunity against an antigen.

In one embodiment, vaccines are administered as killed or attenuated microorganisms, while in another embodiment, vaccines comprise natural or genetically engineered antigens. In one embodiment, effective vaccines stimulate the immune system to promote the development of antibodies that can quickly and effectively attack cells, microorganisms or viruses that produce the antigen against which the subject was vaccination, when they are produced in the subject, thereby preventing disease development.

In one embodiment, a vaccine of the present invention is prophylactic, while in another embodiment, a vaccine of the present invention is therapeutic. In one embodiment, a prophylactic vaccine is administered to a population that is susceptible to developing or contracting a particular disease or condition, whether via environmental exposure or genetic predisposition. Such susceptibility factors are disease-dependent and are well-known to those of skill in the art. For example, the population comprising smokers (in one embodiment, cigarette, cigar, pipe, etc) is known in the art to be susceptible to developing lung cancer. The population comprising a mutation in BRCA-1 and BRCA-2 is known in the art to be susceptible to breast and/or ovarian cancer. The population comprising particular single nucleotide polymorphisms (SNPs) in chromosome 15 inside a region that contains genes for the nicotinic acetylcholine receptor alpha subunits 3 and 5 is known in the art to be susceptible to lung cancer. Other similar susceptibility factors are known in the art, and such susceptible populations are envisioned in one embodiment, to be a population for which a prophylactic vaccine of the instant invention would be most useful.

Thus, vaccines of the present invention are efficacious in inducing an immune response to, preventing, treating, and inducing remission of lymphoma. In another embodiment, the present invention provides a method for overcoming an immune tolerance to a lymphoma in a subject, comprising the step of administering to the subject a peptide of the present invention, thereby overcoming an immune tolerance to a lymphoma.

In another embodiment, the present invention provides a method for overcoming an immune tolerance to a lymphoma in a subject, comprising the step of administering to the subject a nucleotide molecule of the present invention, thereby overcoming an immune tolerance to a lymphoma.

“Tolerance” refers, in another embodiment, to a lack of responsiveness of the host to an antigen. In another embodiment, the term refers to a lack of detectable responsiveness of the host to an antigen. In another embodiment, the term refers to a lack of immunogenicity of an antigen in a host. In another embodiment, tolerance is measured by lack of responsiveness in an in vitro CTL killing assay. In another embodiment, tolerance is measured by lack of responsiveness in a delayed-type hypersensitivity assay. In another embodiment, tolerance is measured by lack of responsiveness in any other suitable assay known in the art. In another embodiment, tolerance is determined or measured as depicted in the Examples herein. Each possibility represents another embodiment of the present invention.

“Overcome” refers, in another embodiment, to a reversal of tolerance by a vaccine. In another embodiment, the term refers to conferment of detectable immune response by a vaccine. In another embodiment, overcoming of immune tolerance is determined or measured as depicted in the Examples herein. Each possibility represents another embodiment of the present invention.

In another embodiment, the present invention provides a method for reducing an incidence of relapse of a lymphoma in a subject in remission from the lymphoma, comprising the step of administering to the subject a peptide of the present invention, thereby reducing an incidence of relapse of a lymphoma in a subject in remission from the lymphoma.

In another embodiment, the present invention provides a method for reducing an incidence of relapse of a lymphoma in a subject in remission from the lymphoma, comprising administering to the subject a nucleotide molecule of the present invention, thereby reducing an incidence of relapse of a lymphoma in a subject in remission from the lymphoma.

In another embodiment, the present invention provides a method for suppressing a formation of a lymphoma, comprising the step of administering a recombinant peptide, protein or polypeptide of the present invention thereby suppressing a formation of a lymphoma.

In another embodiment, the present invention provides a method for suppressing a formation of a lymphoma, comprising the step of administering a nucleotide molecule of the present invention, thereby suppressing a formation of a lymphoma.

In another embodiment, the present invention provides a method of inducing a remission of a residual B cell lymphoma disease, comprising administering a peptide of the present invention, thereby inducing a remission of a residual B cell lymphoma disease.

In another embodiment, the present invention provides a method of inducing a remission of a residual B cell lymphoma disease, comprising administering a nucleotide molecule of the present invention, thereby inducing a remission of a residual B cell lymphoma disease.

In another embodiment, the present invention provides a method of eliminating minimal residual B cell lymphoma disease, comprising administering a peptide of the present invention, thereby eliminating minimal residual B cell lymphoma disease.

In another embodiment, the present invention provides a method of eliminating minimal residual B cell lymphoma disease, comprising administering a nucleotide molecule of the present invention, thereby eliminating minimal residual B cell lymphoma disease.

In another embodiment, the present invention provides a method of reducing a size of a B cell lymphoma, comprising administering a peptide of the present invention, thereby reducing a size of a B cell lymphoma.

In another embodiment, the present invention provides a method of reducing a size of a B cell lymphoma, comprising administering a nucleotide molecule of the present invention, thereby reducing a size of a B cell lymphoma.

In another embodiment, the present invention provides a method of reducing a volume of a B cell lymphoma, comprising administering a peptide of the present invention, thereby reducing a volume of a B cell lymphoma.

In another embodiment, the present invention provides a method of reducing a volume of a B cell lymphoma, comprising administering a nucleotide molecule of the present invention, thereby reducing a volume of a B cell lymphoma.

In another embodiment, the lymphoma that is a target of a method of present invention is, in another embodiment, a Non-Hodgkin's Lymphoma. In another embodiment, a lymphoma is a B cell lymphoma. In another embodiment, a lymphoma is a low-grade lymphoma. In another embodiment, a lymphoma is a low-grade NHL. In another embodiment, a lymphoma is residual disease from one of the above types of lymphoma. In another embodiment, the lymphoma is any other type of lymphoma known in the art. In another embodiment, the lymphoma is a Burkitt's Lymphoma. In another embodiment, the lymphoma is follicular lymphoma. In another embodiment, the lymphoma is marginal zone lymphoma. In another embodiment, the lymphoma is splenic marginal zone lymphoma. In another embodiment, the lymphoma is a mantle cell lymphoma. In another embodiment, the lymphoma is an indolent mantle cell lymphoma. In another embodiment, the lymphoma is any other known type of lymphoma that expresses a BCR. Each type of lymphoma represents a separate embodiment of the present invention.

In another embodiment, cells of the tumor that is targeted by methods and compositions of the present invention express a BCR. In another embodiment, the tumor is associated with a BCR. In another embodiment, the BCR has an idiotype that is characteristic of the tumor. In another embodiment, the BCR expressed by a tumor cell is the target of the immune responses induced by methods and compositions of the present invention.

In another embodiment, the BCR expressed by the target cell is required for a tumor phenotype. In another embodiment, the BCR is necessary for transformation of a tumor cell. In another embodiment, tumor cells that lose expression of the BCR lose their uncontrolled growth, invasiveness, or another feature of malignancy. Each possibility represents a separate embodiment of the present invention.

Methods and compositions of the present invention apply equally to any BCR of a non-Hodgkin's lymphoma and any idiotype thereof. Sequences of BCR are well known in the art, and are readily obtained from lymphoma samples.

An exemplary sequence of a BCR immunoglobulin (Ig) heavy chain precursor is:

MKLWLNWIFLVTLLNGIQCEVKLVESGGGLVQPGGSLSLSCAASGFTFTDYY MSWVRQPPGKALEWLALIRNKANGYTTEYSASVKGRFTISRDNSQSILYLQMNALRA EDSATYYCARDPNYYDGSYEGYFDYWAQGTTLTVSS (SEQ ID NO: 26; GenBank Accession No. X14096).

An exemplary sequence of a BCR Ig light chain precursor is:

LLLISVTVIVSNGEIVLTQSPTTMAASPGEKITITCSASSSISSNYLHWYQQKPGF SPKLLIYRTSNLASGVPARFSGSGSGTSYSLTIGTMEAEDVATYYCQQGSSIPRGVTFG SGTKLEIKR (SEQ ID NO: 27; GenBank Accession No. X14097).

Another exemplary sequence of a BCR Ig light chain precursor is:

GFLLISVTVILTNGEIFLTQSPAIIAASPGEKVTITCSASSSVSYMNWYQQKPGSS PKIWIYGISNLASGVPARFSGSGSGTSFSFTINSMEAEDVATYYCQQRSSYPFTFGSGT KLEIKRADAAPTVSHLP (SEQ ID NO: 28; GenBank Accession No. X14098).

Another exemplary sequence of a BCR Ig light chain precursor is:

LLLISVTVIVSNGEIVLTQSPTTMAASPGEKITITCSASSSISSNYLHWYQQKPGF SPKLLIYRTSNLASGVPARFSGSGSGTSYSLTIGTMEAEDVATYYCQQGSSIPRTFGSG TKLEIKRA (SEQ ID NO: 29; GenBank Accession No. X14099).

Another exemplary sequence of a BCR Ig heavy chain is:

MEFGLSWVFLVAILKGVQCEMQLVESGGGLVQPGESLKLSCAASGFSFSGSTI HWVRQASGRGLEWVGRSRSKADNFMTSYAPSIKGKFIISRDDSSNMLYLQMNNLKT EDTAVYFCTRNFTSLDSTGNSFGPWGQGTLVTVSSGSASAPTLFPLVS (SEQ ID NO: 30; human follicular lymphoma IgM heavy chain; GenBank Accession No. X70200).

Another exemplary sequence of a BCR Ig heavy chain is:

MEFGLSWVFLVAILKGVQCEMQLVESGGGLVQPGESFKLSCAASGFSFSGSTI HWVRQASGRGLEWVGRSRSKADNFMTSYAPSIKGKFIISRDDSSNMMYLQMNNLKN EDTAVYFCTRNFTSLDSTGNSFGPWGQGTLVTVSSGSASAPTLFPLVS (SEQ ID NO: 31; human follicular lymphoma IgM heavy chain; GenBank Accession No. X70199).

Another exemplary sequence of a BCR Ig heavy chain is:

MEFGLSWVFLVAILKGVQCEVQLVESGGGLVQPGGSLRLSCAASGFTVSSNY MSWVRQAPGKGLEWVSVIYSGGSTYYADSVKGRFTISRDNSKNTLYLQMNSLRAED TAVYYCARHTVRGGHCAPRHKPSLQERWGNQRQGALRS (SEQ ID NO: 32; human follicular lymphoma IgM heavy chain; GenBank Accession No. X70208).

Another exemplary sequence of a BCR Ig heavy chain is:

MEFGLSWVFLVAILKGVQCEVQLVESGGGLVQPGGSLKLSCAASGFTF SGSA MHWVRQASGKGLEWVGHIRDKANSYATTYAASVKGRFTISRDDSKNTAYLQMNSL KIEDTAVYFCTRNFTSLDSTGNSFGPW (SEQ ID NO: 33; human follicular lymphoma IgM heavy chain; GenBank Accession No. X70207).

Another exemplary sequence of a BCR Ig light chain is:

SELTQDPVVSVALGQTVRITCQGDSLRSYYASWYQQKPGQAPVLVIYGKNNR PSGIPDRFSGSSSGNTASLTITGAQAEDEADYYCNSRDSSGNLPLFGGGTKLTVLG (SEQ ID NO: 34; human lymphoplasmacytic/lymphoplasmacytoid immunocytoma light chain; GenBank Accession No. AAD14088).

Another exemplary sequence of a BCR Ig light chain is:

DIQMTQSPDSLTVSLGERATINCKSSQSILYSSNDKNYLAWYQQKAGQPPKLLI YWASTRESGVPDRFSGSGSATDFTLTISSLQAEDVAIYYCQQYYSTPLTFGGGTKVEI KR (SEQ ID NO: 35; human follicular lymphoma light chain; GenBank Accession No. Y09250).

Another exemplary sequence of a BCR Ig light chain is:

DIQMTQSPSTLSASVGDRVTITCRASQSISTWLAWYQQKPGKAPKLLIYEASSL ESGVPSRFSGSGSGTEFTLTISSLQPDDFVTYYCQQYNTFSSYTFGQGTKVEIK (SEQ ID NO: 36; human splenic marginal zone lymphoma light chain; GenBank Accession No. AAX93805).

Sequences of other exemplary BCR Ig light chains are found in GenBank Accession Nos. AAX93769-93802, CAA25477, AAB31509, CAE52829-CAE52832, AAF79132-79143, and other sequences found in GenBank. Each sequence represents a separate embodiment of the present invention. CAA73059

Sequences of other exemplary BCR Ig heavy chains are found in GenBank Accession Nos. CAA73044-73059, AAX93809-AAX93842, AAQ74129, CAC39369, AAB52590-AAB52597, and other sequences found in GenBank. Each sequence represents a separate embodiment of the present invention.

Methods for determining complementarity-determining regions (cdr) of a BCR are well known in the art. For example, the CDR1 of SEQ ID NO: 26 consists of residues 50-54; the CDR2 consists of residues 66-87; the D segment consists of residues 120-130; and the J segment consists of residues 131-145. The CDR1 of SEQ ID NO: 30 consists of residues 148-162; the FR2 consists of residues 163-204; the CDR2 consists of residues 205-261; the FR3 consists of residues 262-357; the CDR3 consists of residues 358-432; and the CH1 consists of residues 433-473. In another embodiment, the framework regions (non-cdr regions) are determined by homology with known framework regions of other immunoglobulin molecules from the same species. Each possibility represents a separate embodiment of the present invention.

In another embodiment, an idiotype is identified by determining the cdr of a BCR of methods and compositions of the present invention.

In another embodiment, a complete BCR is contained or utilized in methods and compositions of the present invention. In another embodiment, a fragment of a BCR is contained or utilized. In another embodiment, the BCR fragment contains the idiotype thereof. In another embodiment, the BCR fragment contains a T cell epitope. In another embodiment, the BCR fragment contains an antibody epitope. In another embodiment, “antigen” is used herein to refer to the BCR or fragment thereof that is the target of immune responses induced by methods and compositions of the present invention.

In another embodiment, the fragment of a BCR contained in peptides of the present invention is a single chain fragment of the variable regions (scFV) of the BCR. In another embodiment, the BCR fragment is conformationally intact. In another embodiment, the BCR fragment contains the idiotype of the BCR. In another embodiment, the BCR idiotype is conformationally intact. Each possibility represents a separate embodiment of the present invention.

“Idiotype” refers, in another embodiment, to the structure formed by the complementarity-determining region (cdr) of a BCR. In another embodiment, the term refers to the unique region of a BCR. In another embodiment, the term refers to the antigen-binding site of the BCR. Each possibility represents a separate embodiment of the present invention.

“Conformationally intact” refers, in another embodiment, to a conformation that is not significantly altered relative to the native conformation. In another embodiment, the term refers to an antibody reactivity that is not significantly altered relative to the native protein. In another embodiment, the term refers to an antibody reactivity that overlaps substantially with the native protein. Each possibility represents a separate embodiment of the present invention.

In another embodiment, a peptide utilized in methods of the present invention comprises an idiotype that is homologous to an idiotype expressed by cells of the lymphoma. In another embodiment, the peptide comprises an idiotype that is identical to an idiotype expressed by cells of the lymphoma. Each possibility represents a separate embodiment of the present invention.

In another embodiment, a nucleotide molecule utilized in methods of the present invention encodes an idiotype that is homologous to an idiotype expressed by cells of the lymphoma. In another embodiment, the nucleotide molecule encodes an idiotype that is identical to an idiotype expressed by cells of the lymphoma. In another embodiment, the antigen is highly homologous to the antigen expressed by the tumor cell. “Highly homologous” refers, in another embodiment, to a homology of greater than 90%. In another embodiment, the term refers to a homology of greater than 92%. In another embodiment, the term refers to a homology of greater than 93%. In another embodiment, the term refers to a homology of greater than 94%. In another embodiment, the term refers to a homology of greater than 95%. In another embodiment, the term refers to a homology of greater than 96%. In another embodiment, the term refers to a homology of greater than 97%. In another embodiment, the term refers to a homology of greater than 98%. In another embodiment, the term refers to a homology of greater than 99%. In another embodiment, the term refers to a homology of 100%. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the residual B cell lymphoma disease or minimal residual B cell lymphoma disease treated by a method of the present invention is that remaining after de-bulking therapy. Methods for performing de-bulking therapy are well known in the art, and are described, for example, in Winter J N et al (Low-grade lymphoma. Hematology (Am Soc Hematol Educ Program). 2004; 203-20) and Buske C et al (Current status and perspective of antibody therapy in follicular lymphoma. Haematologica. 2006 January; 91(1):104-12). Each possibility represents a separate embodiment of the present invention.

The heterologous antigenic peptide of methods and compositions of the present invention is, in another embodiment, an antigenic protein. In another embodiment, the antigenic peptide is a fragment of an antigenic protein. In another embodiment, the antigenic peptide is an immunogenic peptide derived from tumor. In another embodiment, the antigenic peptide is an immunogenic peptide derived from metastasis. In another embodiment, the antigenic peptide is an immunogenic peptide derived from cancerous cells. In another embodiment, the antigenic peptide is a pro-angiogenesis immunogenic peptide.

In another embodiment, the antigenic polypeptide is Human Papilloma Virus-E7 (HPV-E7) antigen, which in one embodiment, is from HPV16 (in one embodiment, GenBank Accession No. AAD33253) and in another embodiment, from HPV18 (in one embodiment, GenBank Accession No. P06788). In another embodiment, the antigenic polypeptide is HPV-E6, which in one embodiment, is from HPV16 (in one embodiment, GenBank Accession No. AAD33252, AAM51854, AAM51853, or AAB67615) and in another embodiment, from HPV18 (in one embodiment, GenBank Accession No. P06463). In another embodiment, the antigenic polypeptide is a Her/2-neu antigen. In another embodiment, the antigenic polypeptide is Prostate Specific Antigen (PSA) (in one embodiment, GenBank Accession No. CAD30844, CAD54617, AAA58802, or NP_001639). In another embodiment, the antigenic polypeptide is Stratum Corneum Chymotryptic Enzyme (SCCE) antigen (in one embodiment, GenBank Accession No. AAK69652, AAK69624, AAG33360, AAF01139, or AAC37551). In another embodiment, the antigenic polypeptide is Wilms tumor antigen 1, which in another embodiment is WT-1 Telomerase (GenBank Accession. No. P49952, P22561, NP_659032, CAC39220.2, or EAW68222.1). In another embodiment, the antigenic polypeptide is hTERT or Telomerase (GenBank Accession. No. NM003219 (variant 1), NM198255 (variant 2), NM 198253 (variant 3), or NM 198254 (variant 4). In another embodiment, the antigenic polypeptide is Proteinase 3 (in one embodiment, GenBank Accession No. M29142, M75154, M96839, X55668, NM 00277, M96628 or X56606). In another embodiment, the antigenic polypeptide is Tyrosinase Related Protein 2 (TRP2) (in one embodiment, GenBank Accession No. NP_001913, ABI73976, AAP33051, or Q95119). In another embodiment, the antigenic polypeptide is High Molecular Weight Melanoma Associated Antigen (HMW-MAA) (in one embodiment, GenBank Accession No. NP_001888, AAI28111, or AAQ62842). In another embodiment, the antigenic polypeptide is Testisin (in one embodiment, GenBank Accession No. AAF79020, AAF79019, AAG02255, AAK29360, AAD41588, or NP_659206). In another embodiment, the antigenic polypeptide is NY-ESO-1 antigen (in one embodiment, GenBank Accession No. CAA05908, P78358, AAB49693, or NP_640343). In another embodiment, the antigenic polypeptide is PSCA (in one embodiment, GenBank Accession No. AAH65183, NP_005663, NP_082492, 043653, or CAB97347). In another embodiment, the antigenic polypeptide is Interleukin (IL) 13 Receptor alpha (in one embodiment, GenBank Accession No. NP_000631, NP_001551, NP_032382, NP_598751, NP_001003075, or NP_999506). In another embodiment, the antigenic polypeptide is Carbonic anhydrase IX (CAIX) (in one embodiment, GenBank Accession No. CAI13455, CAI10985, EAW58359, NP_001207, NP_647466, or NP_001101426). In another embodiment, the antigenic polypeptide is carcinoembryonic antigen (CEA) (in one embodiment, GenBank Accession No. AAA66186, CAA79884, CAA66955, AAA51966, AAD15250, or AAA51970.). In another embodiment, the antigenic polypeptide is MAGE-A (in one embodiment, GenBank Accession No. NP_786885, NP_786884, NP_005352, NP_004979, NP_005358, or NP_005353). In another embodiment, the antigenic polypeptide is survivin (in one embodiment, GenBank Accession No. AAC51660, AAY15202, ABF60110, NP_001003019, or NP_001082350). In another embodiment, the antigenic polypeptide is GP100 (in one embodiment, GenBank Accession No. AAC60634, YP_655861, or AAB31176). In another embodiment, the antigenic polypeptide is any other antigenic polypeptide known in the art. In another embodiment, the antigenic peptide of the compositions and methods of the present invention comprise an immunogenic portion of the antigenic polypeptide. Each possibility represents a separate embodiment of the present invention.

In other embodiments, the antigen is derived from a fungal pathogen, bacteria, parasite, helminth, or viruses. In other embodiments, the antigen is selected from tetanus toxoid, hemagglutinin molecules from influenza virus, diphtheria toxoid, HIV gp120, HIV gag protein, HIV env protein, IgA protease, insulin peptide B, Spongospora subterranea antigen, vibriose antigens, Salmonella antigens, pneumococcus antigens, respiratory syncytial virus antigens, Haemophilus influenza outer membrane proteins, Helicobacter pylori urease, Neisseria meningitidis pilins, N. gonorrhoeae pilins, human papilloma virus antigens E1 and E2 from type HPV-16, -18, -31, -33, -35 or -45 human papilloma viruses, the tumor antigens CEA, the ras protein, mutated or otherwise, the p53 protein, mutated or otherwise.

In various embodiments, the antigen of methods and compositions of the present invention includes but is not limited to antigens from the following infectious diseases, measles, mumps, rubella, poliomyelitis, hepatitis A, B (e.g., GenBank Accession No. E02707), and C (e.g., GenBank Accession No. E06890), as well as other hepatitis viruses, type A influenza, other types of influenza, adenovirus (e.g., types 4 and 7), rabies (e.g., GenBank Accession No. M34678), yellow fever, Japanese encephalitis (e.g., GenBank Accession No. E07883), dengue (e.g., GenBank Accession No. M24444), hantavirus, and HIV (e.g., GenBank Accession No. U18552). Bacterial and parasitic antigens will be derived from known causative agents responsible for diseases including, but not limited to, diphtheria, pertussis (e.g., GenBank Accession No. M35274), tetanus (e.g., GenBank Accession No. M64353), tuberculosis, bacterial and fungal pneumonias (e.g., Haemophilus influenzae, Pneumocystis carinii, etc.), cholera, typhoid, plague, shigellosis, salmonellosis (e.g., GenBank Accession No. L03833), Legionnaire's Disease, Lyme disease (e.g., GenBank Accession No. U59487), malaria (e.g., GenBank Accession No. X53832), hookworm, onchocerciasis (e.g., GenBank Accession No. M27807), schistosomiasis (e.g., GenBank Accession No. L08198), trypanosomiasis, leshmaniasis, giardiasis (e.g., GenBank Accession No. M33641), amoebiasis, filariasis (e.g., GenBank Accession No. J03266), borreliosis, and trichinosis.

In other embodiments, the antigen is one of the following tumor antigens: any of the various MAGEs (Melanoma-Associated Antigen E), including MAGE 1 (e.g., GenBank Accession No. M77481), MAGE 2 (e.g., GenBank Accession No. UO3735), MAGE 3, MAGE 4, TRP-2, gp-100, tyrosinase, MART-1, HSP-70, and beta-HCG; a tyrosinase; mutant ras; mutant p53 (e.g., GenBank Accession No. X54156 and AA494311); and p97 melanoma antigen (e.g., GenBank Accession No. M12154). Other tumor-specific antigens include the Ras peptide and p53 peptide associated with advanced cancers, the HPV 16/18 and E6/E7 antigens associated with cervical cancers, MUC1 antigen associated with breast carcinoma (e.g., GenBank Accession No. J0365 1), CEA (carcinoembryonic antigen) associated with colorectal cancer (e.g., GenBank Accession No. X983 11), gp100 (e.g., GenBank Accession No. 573003) or MART1 antigens associated with melanoma, and the prostate-specific antigen (KLK3) associated with prostate cancer (e.g., GenBank Accession No. X14810). The p53 gene sequence is known (See e.g., Harris et al. (1986) Mol. Cell. Biol., 6:4650-4656) and is deposited with GenBank under Accession No. M14694. Tumor antigens encompassed by the present invention further include, but are not limited to, Her-2/Neu (e.g. GenBank Accession Nos. M16789.1, M16790.1, M16791.1, M16792.1), NY-ESO-1 (e.g. GenBank Accession No. U87459), WT-1 (e.g. GenBank Accession Nos. NM000378 (variant A), NM024424 (variant B), NM 024425 (variant C), and NM024426 (variant D)), LAGE-1 (e.g. GenBank Accession No. CAA11044), synovial sarcoma, X (SSX)-2; (e.g. GenBank Accession No. NP_003138, NP_783629, NP_783729, NP_066295), and stratum corneum chymotryptic enzyme (SCCE; GenBank Accession No. NM_005046 and NM_139277)). Thus, the present invention can be used as immunotherapeutics for cancers including, but not limited to, cervical, breast, colorectal, prostate, lung cancers, and for melanomas.

Each antigen represents a separate embodiment of the present invention.

In one embodiment, methods of evaluating the production of an immune response by a subject to an antigen are known in the art, and in one embodiment, are described hereinbelow in the Examples section.

The LLO protein utilized to construct vaccines of the present invention (in another embodiment, used as the source of the LLO fragment incorporated in the vaccines) has, in another embodiment, the sequence:

MKKIMLVFITLILVSLPIAQQTEAKDASAFNKENSISSMAPPASPPASPKTPIEKKHADE IDKYIQGLDYNKNNVLVYHGDAVTNVPPRKGYKDGNEYIVVEKKKKSINQNNADIQ VVNAISSLTYPGALVKANSELVENQPDVLPVKRDSLTLSIDLPGMTNQDNKIVVKNA TKSNVNNAVNTLVERWNEKYAQAYPNVSAKIDYDDEMAYSESQLIAKFGTAFKAV NNSLNVNFGAISEGKMQEEVISFKQIYYNVNVNEPTRPSRFFGKAVTKEQLQALGVN AENPPAYISSVAYGRQVYLKLSTNSHSTKVKAAFDAAVSGKSVSGDVELTNIIKNSSF KAVIYGGSAKDEVQIIDGNLGDLRDILKKGATFNRETPGVPIAYTTNFLKDNELAVIK NNSEYIETTSKAYTDGKINIDHSGGYVAQFNISWDEVNYDPEGNEIVQHKNWSENNK SKLAHFTSSIYLPGNARNINVYAKECTGLAWEWWRTVIDDRNLPLVKNRNISIWGTT LYPKYSNKVDNPIE (GenBank Accession No. P13128; SEQ ID NO: 37; nucleic acid sequence is set forth in GenBank Accession No. X15127). The first 25 AA of the proprotein corresponding to this sequence are the signal sequence and are cleaved from LLO when it is secreted by the bacterium. Thus, in this embodiment, the full-length active LLO protein is 504 residues long. In another embodiment, the LLO protein is a homologue of SEQ ID NO: 37. In another embodiment, the LLO protein is a variant of SEQ ID NO: 37. In another embodiment, the LLO protein is an isomer of SEQ ID NO: 37. In another embodiment, the LLO protein is a fragment of SEQ ID NO: 37. In another embodiment, the LLO protein is a fragment of a homologue of SEQ ID NO: 37. In another embodiment, the LLO protein is a fragment of a variant of SEQ ID NO: 37. In another embodiment, the LLO protein is a fragment of an isomer of SEQ ID NO: 37. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the LLO protein utilized to construct vaccines of methods and compositions the present invention has the sequence as set forth in SEQ ID NO: 46 (Example 5 hereinbelow). In another embodiment, the LLO protein is a variant of SEQ ID NO: 46. In another embodiment, the LLO protein is an isomer of SEQ ID NO: 46. In another embodiment, the LLO protein is a fragment of SEQ ID NO: 46. In another embodiment, the LLO protein is a fragment of a homologue of SEQ ID NO: 46. In another embodiment, the LLO protein is a fragment of a variant of SEQ ID NO: 46. In another embodiment, the LLO protein is a fragment of an isomer of SEQ ID NO: 46.

In another embodiment, the LLO protein utilized to construct vaccines of methods and compositions as provided herein is a detoxified LLO (DTLLO). In another embodiment, the DTLLO is a fragment of the full protein thereof. In another embodiment, LLO is detoxified by replacing the cholesterol binding region with an antigen peptide or epitope thereof. In another embodiment, LLO detoxified by replacing the cholesterol binding region with the E7 epitope. In another embodiment, LLO is detoxified by deleting the cholesterol binding region/domain. In another embodiment, LLO is detoxified by deleting the signal sequence portion of LLO. In another embodiment, LLO is detoxified by deleting the signal sequence and the cholesterol binding region/domain. In another embodiment, DTLLO is used in genetic or chemical fusions to target antigens to increase antigen immunogenicity. In another embodiment, detoxLLO is fused to an antigen. In another embodiment, DTLLO is fused to an antigenic peptide of the methods and compositions described herein.

In one embodiment, the cholesterol binding region or cholesterol binding domain is known as for LLO or may be deduced using methods known in the Art (reviewed in Alouf, Int J Med Microbiol. 2000 October; 290(4-5):351-6, incorporated herein by reference), including site-directed mutagenesis followed by a cholesterol binding assay or sequence conservation of proteins with similar cholesterol-binding functions.

In another embodiment, the LLO protein is a ctLLO. In another embodiment ctLLO is full length LLO in which the CBD has been replaced by an antigen peptide or epitope thereof. In another embodiment “replaced” in can mean via a substitution, or deletion mutation. In another embodiment, the LLO protein is a mutLLO. In another embodiment, a mutLLO is one in which the CBD has been mutated. In another embodiment, the mutLLO is one in which the amino acids in the CBD have been mutated. In another embodiment the mutation is a point mutation, a deletion, an inversion, a substitution, or a combination thereof. In another embodiment the mutation is any mutation known in the art. In another embodiment, the mutated LLO protein comprises any combination of deletions, substitutions, or point mutations in the CBD and/or deletions of the signal sequence of LLO. In another embodiment, mutating the CBD reduces the hemolytic activity of LLO. In another embodiment, the CBD is replaced by known HLA class I restricted epitopes to be used as a vaccine. In another embodiment, the mutated LLO is expressed and purified from E. coli expression systems.

In another embodiment, “LLO fragment” or “ALLO” refers to a fragment of LLO that comprises the PEST-like domain thereof. In another embodiment, the terms refer to an LLO fragment that comprises a PEST sequence. Each possibility represents another embodiment of the present invention.

In another embodiment, the LLO fragment contains residues of a homologous LLO protein that correspond to one of the above AA ranges. The residue numbers need not, in another embodiment, correspond exactly with the residue numbers enumerated above; e.g. if the homologous LLO protein has an insertion or deletion, relative to an LLO protein utilized herein.

In another embodiment, the LLO fragment is any other LLO fragment known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, a whole LLO protein is utilized in methods and compositions of the present invention. In another embodiment, the whole LLO protein is a non-hemolytic LLO protein.

In another embodiment, a recombinant peptide, protein or polypeptide of the present invention further comprises a detectable tag polypeptide. In another embodiment, a detectable tag polypeptide is not included. In other embodiments, the tag polypeptide is green fluorescent protein (GFP), myc, myc-pyruvate kinase (myc-PK), His₆, maltose biding protein (MBP), an influenza virus hemagglutinin tag polypeptide, a flag tag polypeptide (FLAG), and a glutathione-S-transferase (GST) tag polypeptide. However, the invention should in no way be construed to be limited to the nucleic acids encoding the above-listed tag polypeptides. In another embodiment, the present invention utilizes any nucleic acid sequence encoding a polypeptide which functions in a manner substantially similar to these tag polypeptides. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the recombinant vaccine vector of methods and compositions of the present invention is a plasmid. In another embodiment, the present invention provides a method for the introduction of a nucleotide molecule of the present invention into a cell. Methods for constructing and utilizing recombinant vectors are well known in the art and are described, for example, in Sambrook et al. (2001, Molecular Cloning: A Laboratory Manual, Cold Spring Harbor Laboratory, New York), and in Brent et al. (2003, Current Protocols in Molecular Biology, John Wiley & Sons, New York). In another embodiment, the vector is a bacterial vector. In other embodiments, the vector is selected from Salmonella sp., Shigella sp., BCG, L. monocytogenes and S. gordonii. In another embodiment, the fusion proteins are delivered by recombinant bacterial vectors modified to escape phagolysosomal fusion and live in the cytoplasm of the cell. In another embodiment, the vector is a viral vector. In other embodiments, the vector is selected from Vaccinia, Avipox, Adenovirus, AAV, Vaccinia virus NYVAC, Modified vaccinia strain Ankara (MVA), Semliki Forest virus, Venezuelan equine encephalitis virus, herpes viruses, and retroviruses. In another embodiment, the vector is a naked DNA vector. In another embodiment, the vector is any other vector known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, a nucleotide of the present invention is operably linked to a promoter/regulatory sequence that drives expression of the encoded peptide in cells into which the vector is introduced. Promoter/regulatory sequences useful for driving constitutive expression of a gene in a prokaryotic cell are well known in the art and include, for example, the Listeria p60 promoter, the inlA (encodes internalin) promoter, the hly promoter, and the ActA promoter is used. In another embodiment, any other gram positive promoter is used. Promoter/regulatory sequences useful for driving constitutive expression of a gene in a eukaryotic cell (e.g. for a DNA vaccine) are well known in the art and include, but are not limited to, for example, the cytomegalovirus immediate early promoter enhancer sequence, the SV40 early promoter, and the Rous sarcoma virus promoter. In another embodiment, inducible and tissue specific expression of the nucleic acid encoding a peptide of the present invention is accomplished by placing the nucleic acid encoding the peptide under the control of an inducible or tissue specific promoter/regulatory sequence. Examples of tissue specific or inducible promoter/regulatory sequences which are useful for his purpose include, but are not limited to the MMTV LTR inducible promoter, and the SV40 late enhancer/promoter. In another embodiment, a promoter that is induced in response to inducing agents such as metals, glucocorticoids, and the like, is utilized. Thus, it will be appreciated that the invention includes the use of any promoter/regulatory sequence, which is either known or unknown, and which is capable of driving expression of the desired protein operably linked thereto.

In another embodiment, a peptide of the present invention activates an APC (e.g. a DC), mediating at least part of its increased immunogenicity. In another embodiment, the inactivated LLO need not be attached to the idiotype-containing protein to enhance its immunogenicity. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the present invention provides a method for enhancing the immunogenicity of an antigen, comprising fusing an LLO protein or fragment thereof to the antigen. As demonstrated by the data disclosed herein, fusing a mutated LLO protein to an antigen enhances the immunogenicity of the antigen.

In another embodiment of methods and compositions of the present invention, a PEST-like AA sequence is contained in an LLO fusion protein of the present invention. As provided herein, enhanced cell mediated immunity was demonstrated for fusion proteins comprising an antigen and LLO containing the PEST-like AA sequence KENSISSMAPPASPPASPKTPIEKKHADEIDK (SEQ ID NO: 63). In another embodiment, fusion of an antigen to a non-hemolytic LLO including the PEST-like AA sequence, SEQ ID NO: 1, can enhance cell mediated and anti-tumor immunity of the antigen.

In another embodiment, the non-hemolytic LLO protein or fragment thereof of the present invention need not be that which is set forth exactly in the sequences set forth herein, but rather that other alterations, modifications, or changes can be made that retain the functional characteristics of an LLO fused to an antigen as set forth elsewhere herein. In another embodiment, the present invention utilizes an analog of an LLO protein or fragment thereof of the present invention. Analogs differ, in another embodiment, from naturally occurring proteins or peptides by conservative AA sequence differences or by modifications that do not affect sequence, or by both.

In one embodiment, the present invention provides a composition or method in which cytokine expression is increased (see for e.g., Example 19). In one embodiment, the cytokine is TNF-alpha, while in another embodiment, the cytokine is IL-12, while in another embodiment, the cytokine is ISG15, while in another embodiment, the cytokine is a different cytokine known in the art. In one embodiment, the increase may be in cytokine mRNA expression, while in another embodiment, it may be in cytokine secretion, while in another embodiment, the increase may be in both mRNA expression and secretion of cytokines. In another embodiment, compositions and methods of the present invention may increase dendritic cell maturation markers, which in one embodiment, is CD86, in another embodiment, CD40, and in another embodiment MHCII, in another embodiment, another dendritic cell maturation marker known in the art, or, in another embodiment, a combination thereof (see for e.g., Example 20). In another embodiment, compositions and method of the present invention may cause nuclear translocation of transcription factors, which in one embodiment, is NF-kappa-B (see for e.g. Example 22), or in another embodiment, is a different transcription factor known in the art. In another embodiment, compositions and method of the present invention may cause upregulation of cell surface markers, which in one embodiment, may be CD11b, which in one embodiment is Integrin-alpha M (ITGAM); cluster of differentiation molecule 11B; complement receptor 3A (CR3A); or macrophage 1 antigen (MAC-1)A. In another embodiment, a different cell surface marker expressed by immune cells, may be upregulated as would be understood by a skilled artisan.

In one embodiment, “homology” refers to identity to an LLO sequence (e.g. to any of SEQ ID NO: 37, 46, or 48) of greater than 70%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 37, 46, or 48 of greater than 72%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 37, 46, or 48 of greater than 75%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 37, 46, or 48 of greater than 78%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 37, 46, or 48 of greater than 80%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 37, 46, or 48 of greater than 82%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 37, 46, or 48 of greater than 83%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 37, 46, or 48 of greater than 85%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 37, 46, or 48 of greater than 87%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 37, 46, or 48 of greater than 88%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 37, 46, or 48 of greater than 90%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 37, 46, or 48 of greater than 92%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 37, 46, or 48 of greater than 93%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 37, 46, or 48 of greater than 95%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 37, 46, or 48 of greater than 96%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 37, 46, or 48 of greater than 97%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 37, 46, or 48 of greater than 98%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 37, 46, or 48 of greater than 99%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 37, 46, or 48 of 100%. Each possibility represents a separate embodiment of the present invention.

In another embodiment, “homology” refers to identity to a cholesterol-binding domain (e.g. to any of SEQ ID NO: 18, 53, or 55) of greater than 70%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 18, 53, or 55 of greater than 72%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 18, 53, or 55 of greater than 75%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 18, 53, or 55 of greater than 78%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 18, 53, or 55 of greater than 80%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 18, 53, or 55 of greater than 82%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 18, 53, or 55 of greater than 83%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 18, 53, or 55 of greater than 85%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 18, 53, or 55 of greater than 87%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 18, 53, or 55 of greater than 88%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 18, 53, or 55 of greater than 90%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 18, 53, or 55 of greater than 92%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 18, 53, or 55 of greater than 93%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 18, 53, or 55 of greater than 95%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 18, 53, or 55 of greater than 96%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 18, 53, or 55 of greater than 97%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 18, 53, or 55 of greater than 98%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 18, 53, or 55 of greater than 99%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 18, 53, or 55 of 100%. Each possibility represents a separate embodiment of the present invention.

In another embodiment, “homology” refers to identity to an NY-ESO-1 sequence (e.g. to any of SEQ ID NO: 1-15) of greater than 70%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 1-15 of greater than 72%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 1-15 of greater than 75%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 1-15 of greater than 78%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 1-15 of greater than 80%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 1-15 of greater than 82%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 1-15 of greater than 83%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 1-15 of greater than 85%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 1-15 of greater than 87%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 1-15 of greater than 88%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 1-15 of greater than 90%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 1-15 of greater than 92%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 1-15 of greater than 93%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 1-15 of greater than 95%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 1-15 of greater than 96%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 1-15 of greater than 97%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 1-15 of greater than 98%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 1-15 of greater than 99%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 1-15 of 100%. Each possibility represents a separate embodiment of the present invention.

In another embodiment, “homology” refers to identity to an E7 sequence (e.g. to any of any of SEQ ID NO: 17, 19-23) of greater than 70%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 17, 19-23 of greater than 72%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 17, 19-23 of greater than 75%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 17, 19-23 of greater than 78%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 17, 19-23 of greater than 80%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 17, 19-23 of greater than 82%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 17, 19-23 of greater than 83%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 17, 19-23 of greater than 85%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 17, 19-23 of greater than 87%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 17, 19-23 of greater than 88%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 17, 19-23 of greater than 90%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 17, 19-23 of greater than 92%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 17, 19-23 of greater than 93%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 17, 19-23 of greater than 95%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 17, 19-23 of greater than 96%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 17, 19-23 of greater than 97%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 17, 19-23 of greater than 98%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 17, 19-23 of greater than 99%. In another embodiment, “homology” refers to identity to any of SEQ ID NO: 17, 19-23 of 100%. Each possibility represents a separate embodiment of the present invention.

In another embodiment, “homology” refers to identity to a BCR sequence (e.g. to any of any one of SEQ ID NO: 26-36) of greater than 70%. In another embodiment, “homology” refers to identity to any one of SEQ ID NO: 26-36 of greater than 72%. In another embodiment, “homology” refers to identity to any one of SEQ ID NO: 26-36 of greater than 75%. In another embodiment, “homology” refers to identity to any one of SEQ ID NO: 26-36 of greater than 78%. In another embodiment, “homology” refers to identity to any one of SEQ ID NO: 26-36 of greater than 80%. In another embodiment, “homology” refers to identity to any one of SEQ ID NO: 26-36 of greater than 82%. In another embodiment, “homology” refers to identity to any one of SEQ ID NO: 26-36 of greater than 83%. In another embodiment, “homology” refers to identity to any one of SEQ ID NO: 26-36 of greater than 85%. In another embodiment, “homology” refers to identity to any one of SEQ ID NO: 26-36 of greater than 87%. In another embodiment, “homology” refers to identity to any one of SEQ ID NO: 26-36 of greater than 88%. In another embodiment, “homology” refers to identity to any one of SEQ ID NO: 26-36 of greater than 90%. In another embodiment, “homology” refers to identity to any one of SEQ ID NO: 26-36 of greater than 92%. In another embodiment, “homology” refers to identity to any one of SEQ ID NO: 26-36 of greater than 93%. In another embodiment, “homology” refers to identity to any one of SEQ ID NO: 26-36 of greater than 95%. In another embodiment, “homology” refers to identity to any one of SEQ ID NO: 26-36 of greater than 96%. In another embodiment, “homology” refers to identity to any one of SEQ ID NO: 26-36 of greater than 97%. In another embodiment, “homology” refers to identity to any one of SEQ ID NO: 26-36 of greater than 98%. In another embodiment, “homology” refers to identity to any one of SEQ ID NO: 26-36 of greater than 99%. In another embodiment, “homology” refers to identity to any one of SEQ ID NO: 26-36 of 100%. Each possibility represents a separate embodiment of the present invention.

In another embodiment of the present invention, “nucleic acids” or “nucleotide” refers to a string of at least two base-sugar-phosphate combinations. The term includes, in one embodiment, DNA and RNA. “Nucleotides” refers, in one embodiment, to the monomeric units of nucleic acid polymers. RNA is, in one embodiment, in the form of a tRNA (transfer RNA), snRNA (small nuclear RNA), rRNA (ribosomal RNA), mRNA (messenger RNA), anti-sense RNA, small inhibitory RNA (siRNA), micro RNA (miRNA) and ribozymes. The use of siRNA and miRNA has been described (Caudy A A et al, Genes & Devel 16: 2491-96 and references cited therein). In other embodiments, DNA can be in form of plasmid DNA, viral DNA, linear DNA, or chromosomal DNA or derivatives of these groups. In addition, these forms of DNA and RNA can be single, double, triple, or quadruple stranded. The term also includes, in another embodiment, artificial nucleic acids that contain other types of backbones but the same bases. In one embodiment, the artificial nucleic acid is a PNA (peptide nucleic acid). PNA contain peptide backbones and nucleotide bases and are able to bind, in one embodiment, to both DNA and RNA molecules. In another embodiment, the nucleotide is oxetane modified. In another embodiment, the nucleotide is modified by replacement of one or more phosphodiester bonds with a phosphorothioate bond. In another embodiment, the artificial nucleic acid contains any other variant of the phosphate backbone of native nucleic acids known in the art. The use of phosphothiorate nucleic acids and PNA are known to those skilled in the art, and are described in, for example, Neilsen P E, Curr Opin Struct Biot 9:353-57; and Raz N K et al Biochem Biophys Res Commun 297:1075-84. The production and use of nucleic acids is known to those skilled in art and is described, for example, in Molecular Cloning, (2001), Sambrook and Russell, eds. and Methods in Enzymology: Methods for molecular cloning in eukaryotic cells (2003) Purchio and G. C. Fareed. Each nucleic acid derivative represents a separate embodiment of the present invention.

Protein and/or peptide homology for any AA sequence listed herein is determined, in one embodiment, by methods well described in the art, including immunoblot analysis, or via computer algorithm analysis of AA sequences, utilizing any of a number of software packages available, via established methods. Some of these packages include the FASTA, BLAST, MPsrch or Scanps packages, and employ, in other embodiments, the use of the Smith and Waterman algorithms, and/or global/local or BLOCKS alignments for analysis, for example. Each method of determining homology represents a separate embodiment of the present invention.

In another embodiment, a recombinant peptide, protein or polypeptide of the present invention is made by a process that comprises the step of chemically conjugating a peptide comprising the LLO protein or fragment thereof to a peptide comprising the antigen. In another embodiment, an LLO protein or fragment thereof is chemically conjugated to a peptide comprising the antigen. In another embodiment, a peptide comprising the LLO protein or fragment thereof is chemically conjugated to the antigen. In another embodiment, the LLO protein or fragment thereof is chemically conjugated to the antigen. Each possibility represents a separate embodiment of the present invention.

“Peptide” refers, in another embodiment, to a chain of AA connected with peptide bonds. In one embodiment, a peptide is a short chain of AAs. In another embodiment, the term refers to a variant peptide molecule, containing any modification disclosed or enumerated herein. In another embodiment, the term refers to a molecule containing one or more moieties introduced by a chemical cross-linker. In another embodiment, the term refers to a peptide mimetic molecule. In another embodiment, the term refers to any other type of variant of a peptide molecule known in the art. Each possibility represents a separate embodiment of the present invention.

In one embodiment, the term “protein” or “polypeptide” is an amino acid chain comprising multiple peptide subunits, including a full-length protein, oligopeptides, and fragments thereof, wherein the amino acid residues are linked by covalent peptide bonds. In one embodiment, a protein described in the present invention may alternatively be a polypeptide of the present invention.

As used herein in the specification and in the examples section which follows the term “peptide” includes native peptides (either degradation products, synthetically synthesized peptides or recombinant peptides) and peptidomimetics (typically, synthetically synthesized peptides), such as peptoids and semipeptoids which are peptide analogs, which may have, for example, modifications rendering the peptides more stable while in a body or more capable of penetrating into bacterial cells. Such modifications include, but are not limited to N terminus modification, C terminus modification, peptide bond modification, including, but not limited to, CH2-NH, CH2-S, CH2-S═O, O═C—NH, CH2-O, CH2-CH2, S═C—NH, CH═CH or CF═CH, backbone modifications, and residue modification. Methods for preparing peptidomimetic compounds are well known in the art and are specified, for example, in Quantitative Drug Design, C. A. Ramsden Gd., Chapter 17.2, F. Choplin Pergamon Press (1992), which is incorporated by reference as if fully set forth herein. Further details in this respect are provided hereinunder.

Peptide bonds (—CO—NH—) within the peptide may be substituted, for example, by N-methylated bonds (—N(CH3)-CO—), ester bonds (—C(R)H—C—O—O—C(R)—N—), ketomethylen bonds (—CO—CH2-), α-aza bonds (—NH—N(R)—CO—), wherein R is any alkyl, e.g., methyl, carba bonds (—CH2-NH—), hydroxyethylene bonds (—CH(OH)—CH2-), thioamide bonds (—CS—NH—), olefinic double bonds (—CH═CH—), retro amide bonds (—NH—CO—), peptide derivatives (—N(R)—CH2-CO—), wherein R is the “normal” side chain, naturally presented on the carbon atom.

These modifications can occur at any of the bonds along the peptide chain and even at several (2-3) at the same time.

Natural aromatic amino acids, Trp, Tyr and Phe, may be substituted for synthetic non-natural acid such as TIC, naphthylelanine (Nol), ring-methylated derivatives of Phe, halogenated derivatives of Phe or o-methyl-Tyr.

In addition to the above, the peptides of the present invention may also include one or more modified amino acids or one or more non-amino acid monomers (e.g. fatty acids, complex carbohydrates etc).

As used herein in the specification and in the claims section below the term “amino acid” or “amino acids” is understood to include the 20 naturally occurring amino acids; those amino acids often modified post-translationally in vivo, including, for example, hydroxyproline, phosphoserine and phosphothreonine; and other unusual amino acids including, but not limited to, 2-aminoadipic acid, hydroxylysine, isodesmosine, nor-valine, nor-leucine and ornithine. Furthermore, the term “amino acid” includes both D- and L-amino acids.

Tables 1 and 2 below list naturally occurring amino acids (Table 1) and non-conventional or modified amino acids (Table 2) which can be used with the present invention.

TABLE 1 Three-Letter One-letter Amino Acid Abbreviation Symbol Alanine Ala A Arginine Arg R Asparagine Asn N Aspartic acid Asp D Cysteine Cys C Glutamine Gln Q Glutamic Acid Glu E Glycine Gly G Histidine His H Isoleucine Iie I Leucine Leu L Lysine Lys K Methionine Met M Phenylalanine Phe F Proline Pro P Serine Ser S Threonine Thr T Tryptophan Trp W Tyrosine Tyr Y Valine Val V Any amino acid as Xaa X above

TABLE 2 Non-conventional amino acid Code α-aminobutyric acid Abu α-amino-α- Mgabu methylbutyrate aminocyclopropane- Cpro carboxylate aminoisobutyric acid Aib aminonorbornyl- Norb carboxylate cyclohexylalanine Chexa cyclopentylalanine Cpen D-alanine Dal D-arginine Darg D-aspartic acid Dasp D-cysteine Dcys D-glutamine Dgln D-glutamic acid Dglu D-histidine Dhis D-isoleucine Dile D-leucine Dleu D-lysine Dlys D-methionine Dmet D-ornithine Dorn D-phenylalanine Dphe D-proline Dpro D-serine Dser D-threonine Dthr D-tryptophan Dtrp D-tyrosine Dtyr D-valine Dval D-α-methylalanine Dmala D-α-methylarginine Dmarg D-α-methylasparagine Dmasn D-α-methylaspartate Dmasp D-α-methylcysteine Dmcys D-α-methylglutamine Dmgln D-α-methylhistidine Dmhis D-α-methylisoleucine Dmile D-α-methylleucine Dmleu D-α-methyllysine Dmlys D-α-methylmethionine Dmmet D-α-methylornithine Dmorn D-α-methylphenylalanine Dmphe D-α-methylproline Dmpro D-α-methylserine Dmser D-α-methylthreonine Dmthr D-α-methyltryptophan Dmtrp D-α-methyltyrosine Dmty D-α-methylvaline Dmval D-α-methylalnine Dnmala D-α-methylarginine Dnmarg D-α-methylasparagine Dnmasn D-α-methylasparatate Dnmasp D-α-methylcysteine Dnmcys D-N-methylleucine Dnmleu D-N-methyllysine Dnmlys N-methylcyclohexylalanine Nmchexa D-N-methylornithine Dnmorn N-methylglycine Nala N-methylaminoisobutyrate Nmaib N-(1-methylpropyl)glycine Nile N-(2-methylpropyl)glycine Nile N-(2-methylpropyl)glycine Nleu D-N-methyltryptophan Dnmtrp D-N-methyltyrosine Dnmtyr D-N-methylvaline Dnmval γ-aminobutyric acid Gabu L-t-butylglycine Tbug L-ethylglycine Etg L-homophenylalanine Hphe L-α-methylarginine Marg L-α-methylaspartate Masp L-α-methylcysteine Mcys L-α-methylglutamine Mgln L-α-methylhistidine Mhis L-α-methylisoleucine Mile D-N-methylglutamine Dnmgln D-N-methylglutamate Dnmglu D-N-methylhistidine Dnmhis D-N-methylisoleucine Dnmile D-N-methylleucine Dnmleu D-N-methyllysine Dnmlys N-methylcyclohexylalanine Nmchexa D-N-methylornithine Dnmorn N-methylglycine Nala N-methylaminoisobutyrate Nmaib N-(1-methylpropyl)glycine Nile N-(2-methylpropyl)glycine Nleu D-N-methyltryptophan Dnmtrp D-N-methyltyrosine Dnmtyr D-N-methylvaline Dnmval γ-aminobutyric acid Gabu L-t-butylglycine Tbug L-ethylglycine Etg L-homophenylalanine Hphe L-α-methylarginine Marg L-α-methylaspartate Masp L-α-methylcysteine Mcys L-α-methylglutamine Mgln L-α-methylhistidine Mhis L-α-methylisoleucine Mile L-α-methylleucine Mleu L-α-methylmethionine Mmet L-α-methylnorvaline Mnva L-α-methylphenylalanine Mphe L-α-methylserine mser L-α-methylvaline Mtrp L-α-methylleucine Mval Nnbhm N-(N-(2,2-diphenylethyl) Nnbhm carbamylmethyl-glycine 1-carboxy-1-(2,2-diphenyl Nmbc ethylamino)cyclopropane L-N-methylalanine Nmala L-N-methylarginine Nmarg L-N-methylasparagine Nmasn L-N-methylaspartic acid Nmasp L-N-methylcysteine Nmcys L-N-methylglutamine Nmgin L-N-methylglutamic acid Nmglu L-N-methylhistidine Nmhis L-N-methylisolleucine Nmile L-N-methylleucine Nmleu L-N-methyllysine Nmlys L-N-methylmethionine Nmmet L-N-methylnorleucine Nmnle L-N-methylnorvaline Nmnva L-N-methylornithine Nmorn L-N-methylphenylalanine Nmphe L-N-methylproline Nmpro L-N-methylserine Nmser L-N-methylthreonine Nmthr L-N-methyltryptophan Nmtrp L-N-methyltyrosine Nmtyr L-N-methylvaline Nmval L-N-methylethylglycine Nmetg L-N-methyl-t-butylglycine Nmtbug L-norleucine Nle L-norvaline Nva α-methyl-aminoisobutyrate Maib α-methyl-γ-aminobutyrate Mgabu α-methylcyclohexylalanine Mchexa α-methylcyclopentylalanine Mcpen α-methyl-α-napthylalanine Manap α-methylpenicillamine Mpen N-(4-aminobutyl)glycine Nglu N-(2-aminoethyl)glycine Naeg N-(3-aminopropyl)glycine Norn N-amino-α-methylbutyrate Nmaabu α-napthylalanine Anap N-benzylglycine Nphe N-(2-carbamylethyl)glycine Ngln N-(carbamylmethyl)glycine Nasn N-(2-carboxyethyl)glycine Nglu N-(carboxymethyl)glycine Nasp N-cyclobutylglycine Ncbut N-cycloheptylglycine Nchep N-cyclohexylglycine Nchex N-cyclodecylglycine Ncdec N-cyclododeclglycine Ncdod N-cyclooctylglycine Ncoct N-cyclopropylglycine Ncpro N-cycloundecylglycine Ncund N-(2,2-diphenylethyl)glycine Nbhm N-(3,3-diphenylpropyl)glycine Nbhe N-(3-indolylyethyl) glycine Nhtrp N-methyl-γ-aminobutyrate Nmgabu D-N-methylmethionine Dnmmet N-methylcyclopentylalanine Nmcpen D-N-methylphenylalanine Dnmphe D-N-methylproline Dnmpro D-N-methylserine Dnmser D-N-methylserine Dnmser D-N-methylthreonine Dnmthr N-(1-methylethyl)glycine Nva N-methyla-napthylalanine Nmanap N-methylpenicillamine Nmpen N-(p-hydroxyphenyl)glycine Nhtyr N-(thiomethyl)glycine Ncys penicillamine Pen L-α-methylalanine Mala L-α-methylasparagine Masn L-α-methyl-t-butylglycine Mtbug L-methylethylglycine Metg L-α-methylglutamate Mglu L-α-methylhomophenylalanine Mhphe N-(2-methylthioethyl)glycine Nmet N-(3-guanidinopropyl)glycine Narg N-(1-hydroxyethyl)glycine Nthr N-(hydroxyethyl)glycine Nser N-(imidazolylethyl)glycine Nhis N-(3-indolylyethyl)glycine Nhtrp N-methyl-γ-aminobutyrate Nmgabu D-N-methylmethionine Dnmmet N-methylcyclopentylalanine Nmcpen D-N-methylphenylalanine Dnmphe D-N-methylproline Dnmpro D-N-methylserine Dnmser D-N-methylthreonine Dnmthr N-(1-methylethyl)glycine Nval N-methyla-napthylalanine Nmanap N-methylpenicillamine Nmpen N-(p-hydroxyphenyl)glycine Nhtyr N-(thiomethyl)glycine Ncys penicillamine Pen L-α-methylalanine Mala L-α-methylasparagine Masn L-α-methyl-t-butylglycine Mtbug L-methylethylglycine Metg L-α-methylglutamate Mglu L-α-methylhomophenylalanine Mhphe N-(2-methylthioethyl)glycine Nmet L-α-methyllysine Mlys L-α-methylnorleucine Mnle L-α-methylornithine Morn L-α-methylproline Mpro L-α-methylthreonine Mthr L-α-methyltyrosine Mtyr L-N-methylhomophenylalanine Nmhphe N-(N-(3,3-diphenylpropyl) Nnbhe carbamylmethyl(1)glycine

In another embodiment, the method used for conjugating the non-hemolytic LLO protein or fragment thereof to the antigen is that described in Example 11. In another embodiment, another method known in the art is utilized. Methods for chemical conjugation of peptides to one another are well known in the art, and are described for, example, in (Biragyn, A and Kwak, L W (2001) Mouse models for lymphoma in “Current Protocols in Immunology” 20.6.1-20.6.30) and (Collawn, J. F. and Paterson, Y. (1989) Preparation of Anti-peptide antibodies. In Current Protocols in Molecular Biology. Supplement 6. Ed. F. M. Ausubel et. al. Greene Publishing/Wiley 11.14.1-11.15.3).

In another embodiment, the non-hemolytic LLO protein or fragment thereof or N-terminal LLO fragment is attached to the antigen or fragment thereof by chemical conjugation. In another embodiment, the non-hemolytic LLO protein or fragment thereof or N-terminal LLO fragment is attached to the heterologous peptide by chemical conjugation. In another embodiment, glutaraldehyde is used for the conjugation. In another embodiment, the conjugation is performed using any suitable method known in the art. Each possibility represents another embodiment of the present invention.

In another embodiment, a fusion peptide of the present invention is synthesized using standard chemical peptide synthesis techniques. In another embodiment, the chimeric molecule is synthesized as a single contiguous polypeptide. In another embodiment, the LLO protein, ActA protein, or fragment thereof; and the BCR or fragment thereof are synthesized separately, then fused by condensation of the amino terminus of one molecule with the carboxyl terminus of the other molecule, thereby forming a peptide bond. In another embodiment, the ActA protein or LLO protein and antigen are each condensed with one end of a peptide spacer molecule, thereby forming a contiguous fusion protein.

In another embodiment, fusion proteins of the present invention are prepared by any suitable method, including, for example, cloning and restriction of appropriate sequences or direct chemical synthesis by methods discussed below. In another embodiment, subsequences are cloned and the appropriate subsequences cleaved using appropriate restriction enzymes. The fragments are then ligated, in another embodiment, to produce the desired DNA sequence. In another embodiment, DNA encoding the fusion protein is produced using DNA amplification methods, for example polymerase chain reaction (PCR). First, the segments of the native DNA on either side of the new terminus are amplified separately. The 5′ end of the one amplified sequence encodes the peptide linker, while the 3′ end of the other amplified sequence also encodes the peptide linker. Since the 5′ end of the first fragment is complementary to the 3′ end of the second fragment, the two fragments (after partial purification, e.g. on LMP agarose) can be used as an overlapping template in a third PCR reaction. The amplified sequence will contain codons, the segment on the carboxy side of the opening site (now forming the amino sequence), the linker, and the sequence on the amino side of the opening site (now forming the carboxyl sequence). The insert is then ligated into a plasmid.

In another embodiment, a recombinant peptide, protein or polypeptide of the present invention is synthesized using standard chemical peptide synthesis techniques. In another embodiment, the chimeric molecule is synthesized as a single contiguous polypeptide. In another embodiment, the non-hemolytic LLO protein or fragment thereof; and the antigen are synthesized separately, then fused by condensation of the amino terminus of one molecule with the carboxyl terminus of the other molecule, thereby forming a peptide bond. In another embodiment, the LLO protein and antigen are each condensed with one end of a peptide spacer molecule, thereby forming a contiguous fusion protein.

In another embodiment, the peptides and proteins of the present invention are prepared by solid-phase peptide synthesis (SPPS) as described by Stewart et al. in Solid Phase Peptide Synthesis, 2nd Edition, 1984, Pierce Chemical Company, Rockford, Ill.; or as described by Bodanszky and Bodanszky (The Practice of Peptide Synthesis, 1984, Springer-Verlag, New York). In another embodiment, a suitably protected AA residue is attached through its carboxyl group to a derivatized, insoluble polymeric support, such as cross-linked polystyrene or polyamide resin. “Suitably protected” refers to the presence of protecting groups on both the alpha-amino group of the amino acid, and on any side chain functional groups. Side chain protecting groups are generally stable to the solvents, reagents and reaction conditions used throughout the synthesis, and are removable under conditions which will not affect the final peptide product. Stepwise synthesis of the oligopeptide is carried out by the removal of the N-protecting group from the initial AA, and couple thereto of the carboxyl end of the next AA in the sequence of the desired peptide. This AA is also suitably protected. The carboxyl of the incoming AA can be activated to react with the N-terminus of the support-bound AA by formation into a reactive group such as formation into a carbodiimide, a symmetric acid anhydride or an “active ester” group such as hydroxybenzotriazole or pentafluorophenly esters.

Examples of solid phase peptide synthesis methods include the BOC method which utilized tert-butyloxcarbonyl as the alpha-amino protecting group, and the FMOC method which utilizes 9-fluorenylmethyloxcarbonyl to protect the alpha-amino of the AA residues, both methods of which are well-known by those of skill in the art.

In another embodiment, incorporation of N- and/or C-blocking groups is achieved using protocols conventional to solid phase peptide synthesis methods. For incorporation of C-terminal blocking groups, for example, synthesis of the desired peptide is typically performed using, as solid phase, a supporting resin that has been chemically modified so that cleavage from the resin results in a peptide having the desired C-terminal blocking group. To provide peptides in which the C-terminus bears a primary amino blocking group, for instance, synthesis is performed using a p-methylbenzhydrylamine (MBHA) resin so that, when peptide synthesis is completed, treatment with hydrofluoric acid releases the desired C-terminally amidated peptide. Similarly, incorporation of an N-methylamine blocking group at the C-terminus is achieved using N-methylaminoethyl-derivatized DVB, resin, which upon HF treatment releases a peptide bearing an N-methylamidated C-terminus Blockage of the C-terminus by esterification can also be achieved using conventional procedures. This entails use of resin/blocking group combination that permits release of side-chain peptide from the resin, to allow for subsequent reaction with the desired alcohol, to form the ester function. FMOC protecting group, in combination with DVB resin derivatized with methoxyalkoxybenzyl alcohol or equivalent linker, can be used for this purpose, with cleavage from the support being effected by TFA in dicholoromethane. Esterification of the suitably activated carboxyl function e.g. with DCC, can then proceed by addition of the desired alcohol, followed by deprotection and isolation of the esterified peptide product.

Incorporation of N-terminal blocking groups can be achieved while the synthesized peptide is still attached to the resin, for instance by treatment with a suitable anhydride and nitrile. To incorporate an acetyl blocking group at the N-terminus, for instance, the resin coupled peptide can be treated with 20% acetic anhydride in acetonitrile. The N-blocked peptide product can then be cleaved from the resin, deprotected and subsequently isolated.

In another embodiment, analysis of the peptide composition is conducted to verify the identity of the produced peptide. In another embodiment, AA composition analysis is conducted using high-resolution mass spectrometry to determine the molecular weight of the peptide. Alternatively, or additionally, the AA content of the peptide is confirmed by hydrolyzing the peptide in aqueous acid, and separating, identifying and quantifying the components of the mixture using HPLC, or an AA analyzer. Protein sequencers, which sequentially degrade the peptide and identify the AA in order, can also be used to determine definitely the sequence of the peptide.

In another embodiment, prior to its use, the peptide is purified to remove contaminants. In another embodiment, the peptide is purified so as to meet the standards set out by the appropriate regulatory agencies and guidelines. Any one of a number of a conventional purification procedures can be used to attain the required level of purity, including, for example, reversed-phase high-pressure liquid chromatography (HPLC) using an alkylated silica column such as C₄-, C₈- or C₁₈-silica. A gradient mobile phase of increasing organic content is generally used to achieve purification, for example, acetonitrile in an aqueous buffer, usually containing a small amount of trifluoroacetic acid. Ion-exchange chromatography can be also used to separate peptides based on their charge.

Solid phase synthesis in which the C-terminal AA of the sequence is attached to an insoluble support followed by sequential addition of the remaining AA in the sequence is used, in another embodiment, for the chemical synthesis of the peptides of this invention. Techniques for solid phase synthesis are described by Barany and Merrifield in Solid-Phase Peptide Synthesis; pp. 3-284 in The Peptides: Analysis, Synthesis, Biology. Vol. 2: Special Methods in Peptide Synthesis, Part A., Merrifield, et al. J. Am. Chem. Soc., 85: 2149-2156 (1963), and Stewart et al., Solid Phase Peptide Synthesis, 2nd ed. Pierce Chem. Co., Rockford, Ill. (1984).

In another embodiment, fusion proteins of the present invention are synthesized using recombinant DNA methodology. In another embodiment, DNA encoding the fusion protein of the present invention is prepared by any suitable method, including, for example, cloning and restriction of appropriate sequences or direct chemical synthesis by methods such as the phosphotriester method of Narang et al. (1979, Meth. Enzymol. 68: 90-99); the phosphodiester method of Brown et al. (1979, Meth. Enzymol 68: 109-151); the diethylphosphoramidite method of Beaucage et al. (1981, Tetra. Lett., 22: 1859-1862); and the solid support method of U.S. Pat. No. 4,458,066.

In another embodiment, peptides of the present invention incorporate AA residues that are modified without affecting activity. In another embodiment, the termini are derivatized to include blocking groups, i.e. chemical substituents suitable to protect and/or stabilize the N- and C-termini from “undesirable degradation”, a term meant to encompass any type of enzymatic, chemical or biochemical breakdown of the compound at its termini which is likely to affect the function of the compound, i.e. sequential degradation of the compound at a terminal end thereof.

In another embodiment, blocking groups include protecting groups conventionally used in the art of peptide chemistry that will not adversely affect the in vivo activities of the peptide. For example, suitable N-terminal blocking groups can be introduced by alkylation or acylation of the N-terminus Examples of suitable N-terminal blocking groups include C₁-C₅ branched or unbranched alkyl groups, acyl groups such as formyl and acetyl groups, as well as substituted forms thereof, such as the acetamidomethyl (Acm) group. Desamino AA analogs are also useful N-terminal blocking groups, and can either be coupled to the N-terminus of the peptide or used in place of the N-terminal reside. Suitable C-terminal blocking groups, in which the carboxyl group of the C-terminus is either incorporated or not, include esters, ketones or amides. Ester or ketone-forming alkyl groups, particularly lower alkyl groups such as methyl, ethyl and propyl, and amide-forming amino groups such as primary amines (—NH₂), and mono- and di-alkyl amino groups such as methyl amino, ethylamino, dimethylamino, diethylamino, methylethylamino and the like are examples of C-terminal blocking groups. Descarboxylated AA analogues such as agmatine are also useful C-terminal blocking groups and can be either coupled to the peptide's C-terminal residue or used in place of it. In another embodiment, the free amino and carboxyl groups at the termini are removed altogether from the peptide to yield desamino and descarboxylated forms thereof without affect on peptide activity.

In another embodiment, other modifications are incorporated without adversely affecting the activity. In another embodiment, such modifications include, but are not limited to, substitution of one or more of the AA in the natural L-isomeric form with D-isomeric AA. In another embodiment, the peptide includes one or more D-amino acid resides, or comprises AA that are all in the D-form. Retro-inverso forms of peptides in accordance with the present invention are also contemplated, for example, inverted peptides in which all amino acids are substituted with D-amino acid forms.

In another embodiment, acid addition salts peptides of the present invention are utilized as functional equivalents thereof. In another embodiment, a peptide in accordance with the present invention treated with an inorganic acid such as hydrochloric, hydrobromic, sulfuric, nitric, phosphoric, and the like, or an organic acid such as an acetic, propionic, glycolic, pyruvic, oxalic, malic, malonic, succinic, maleic, fumaric, tataric, citric, benzoic, cinnamic, mandelic, methanesulfonic, ethanesulfonic, p-toluenesulfonic, salicyclic and the like, to provide a water soluble salt of the peptide is suitable for use in the invention.

In another embodiment, modifications (which do not normally alter primary sequence) include in vivo, or in vitro chemical derivatization of polypeptides, e.g., acetylation, or carboxylation. Also included are modifications of glycosylation, e.g., those made by modifying the glycosylation patterns of a polypeptide during its synthesis and processing or in further processing steps; e.g., by exposing the polypeptide to enzymes which affect glycosylation, e.g., mammalian glycosylating or deglycosylating enzymes. Also embraced are sequences which have phosphorylated AA residues, e.g., phosphotyrosine, phosphoserine, or phosphothreonine.

In another embodiment, polypeptides are modified using ordinary molecular biological techniques so as to improve their resistance to proteolytic degradation or to optimize solubility properties or to render them more suitable as a therapeutic agent. Analogs of such polypeptides include those containing residues other than naturally occurring L-amino acids, e.g., D-amino acids or non-naturally occurring synthetic amino acids. The peptides of the invention are not limited to products of any of the specific exemplary processes listed herein.

In another embodiment, the present invention provides a kit comprising an non-hemolytic LLO protein or fragment thereof fused to an antigen, an applicator, and instructional material that describes use of the methods of the invention. Although model kits are described below, the contents of other useful kits will be apparent to the skilled artisan in light of the present disclosure. Each of these kits is contemplated within the present invention.

In another embodiment, the Listeria strain of methods and compositions of the present invention is a recombinant Listeria seeligeri strain. In another embodiment, the Listeria strain is a recombinant Listeria grayi strain. In another embodiment, the Listeria strain is a recombinant Listeria ivanovii strain. In another embodiment, the Listeria strain is a recombinant Listeria murrayi strain. In another embodiment, the Listeria strain is a recombinant Listeria welshimeri strain. In another embodiment, the Listeria strain is a recombinant strain of any other Listeria species known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, a recombinant Listeria strain of the present invention has been passaged through an animal host. In another embodiment, the passaging maximizes efficacy of the strain as a vaccine vector. In another embodiment, the passaging stabilizes the immunogenicity of the Listeria strain. In another embodiment, the passaging stabilizes the virulence of the Listeria strain. In another embodiment, the passaging increases the immunogenicity of the Listeria strain. In another embodiment, the passaging increases the virulence of the Listeria strain. In another embodiment, the passaging removes unstable sub-strains of the Listeria strain. In another embodiment, the passaging reduces the prevalence of unstable sub-strains of the Listeria strain. In another embodiment, the Listeria strain contains a genomic insertion of the gene encoding a recombinant peptide, protein or polypeptide of the present invention. In another embodiment, the Listeria strain carries a plasmid comprising the gene encoding a recombinant peptide, protein or polypeptide of the present invention. Methods for passaging a recombinant Listeria strain through an animal host are well known in the art, and are described, for example, in United States Patent Application No. 2006/0233835, which is incorporated herein by reference. In another embodiment, the passaging is performed by any other method known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the recombinant Listeria strain utilized in methods of the present invention has been stored in a frozen cell bank. In another embodiment, the recombinant Listeria strain has been stored in a lyophilized cell bank. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the cell bank of methods and compositions of the present invention is a master cell bank. In another embodiment, the cell bank is a working cell bank. In another embodiment, the cell bank is Good Manufacturing Practice (GMP) cell bank. In another embodiment, the cell bank is intended for production of clinical-grade material. In another embodiment, the cell bank conforms to regulatory practices for human use. In another embodiment, the cell bank is any other type of cell bank known in the art. Each possibility represents a separate embodiment of the present invention.

“Good Manufacturing Practices” are defined, in another embodiment, by (21 CFR 210-211) of the United States Code of Federal Regulations. In another embodiment, “Good Manufacturing Practices” are defined by other standards for production of clinical-grade material or for human consumption; e.g. standards of a country other than the United States. Each possibility represents a separate embodiment of the present invention.

In another embodiment, a recombinant Listeria strain utilized in methods of the present invention is from a batch of vaccine doses.

In another embodiment, a recombinant Listeria strain utilized in methods of the present invention is from a frozen stock produced by a method disclosed herein.

In another embodiment, a recombinant Listeria strain utilized in methods of the present invention is from a lyophilized stock produced by a method disclosed herein. Methods for lyophilizing recombinant Listeria strains are well known in the art, and are described, for example, in PCT International Patent Application Publication No. WO 2007/061848. Each method represents a separate embodiment of the present invention.

In another embodiment, a cell bank, frozen stock, or batch of vaccine doses of the present invention is cryopreserved by a method that comprises growing a culture of the Listeria strain in a nutrient media, freezing the culture in a solution comprising glycerol, and storing the Listeria strain at below −20 degrees Celsius. In another embodiment, the temperature is about −70 degrees Celsius. In another embodiment, the temperature is about ⁻70-⁻80 degrees Celsius.

In another embodiment, a cell bank, frozen stock, or batch of vaccine doses of the present invention is cryopreserved by a method that comprises growing a culture of the Listeria strain in a defined media of the present invention (as described below), freezing the culture in a solution comprising glycerol, and storing the Listeria strain at below −20 degrees Celsius. In another embodiment, the temperature is about −70 degrees Celsius. In another embodiment, the temperature is about ⁻70-⁻80 degrees Celsius. Methods for cryopreservation of recombinant Listeria strains are well known in the art, and are described, for example, in PCT International Patent Application Publication No. WO 2007/061848. Each method represents a separate embodiment of the present invention.

In another embodiment, any defined microbiological media of the present invention may be used in this method. Each defined microbiological media represents a separate embodiment of the present invention.

In another embodiment of methods and compositions of the present invention, the culture (e.g. the culture of a Listeria vaccine strain that is used to produce a batch of Listeria vaccine doses) is inoculated from a cell bank. In another embodiment, the culture is inoculated from a frozen stock. In another embodiment, the culture is inoculated from a starter culture. In another embodiment, the culture is inoculated from a colony. In another embodiment, the culture is inoculated at mid-log growth phase. In another embodiment, the culture is inoculated at approximately mid-log growth phase. In another embodiment, the culture is inoculated at another growth phase. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the solution used for freezing contains another colligative additive or additive with anti-freeze properties, in place of glycerol. In another embodiment, the solution used for freezing contains another colligative additive or additive with anti-freeze properties, in addition to glycerol. In another embodiment, the additive is mannitol. In another embodiment, the additive is DMSO. In another embodiment, the additive is sucrose. In another embodiment, the additive is any other colligative additive or additive with anti-freeze properties that is known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, the nutrient media utilized for growing a culture of a Listeria strain is LB. In another embodiment, the nutrient media is TB. In another embodiment, the nutrient media is a modified, animal-product free Terrific Broth. In another embodiment, the nutrient media is a defined media. In another embodiment, the nutrient media is a defined media of the present invention. In another embodiment, the nutrient media is any other type of nutrient media known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment of methods and compositions of the present invention, the step of growing is performed with a shake flask. In another embodiment, the flask is a baffled shake flask. In another embodiment, the growing is performed with a batch fermenter. In another embodiment, the growing is performed with a stirred tank or flask. In another embodiment, the growing is performed with an airflit fermenter. In another embodiment, the growing is performed with a fed batch. In another embodiment, the growing is performed with a continuous cell reactor. In another embodiment, the growing is performed with an immobilized cell reactor. In another embodiment, the growing is performed with any other means of growing bacteria that is known in the art. Each possibility represents a separate embodiment of the present invention.

In another embodiment, a constant pH is maintained during growth of the culture (e.g. in a batch fermenter). In another embodiment, the pH is maintained at about 7.0. In another embodiment, the pH is about 6. In another embodiment, the pH is about 6.5. In another embodiment, the pH is about 7.5. In another embodiment, the pH is about 8. In another embodiment, the pH is 6.5-7.5. In another embodiment, the pH is 6-8. In another embodiment, the pH is 6-7. In another embodiment, the pH is 7-8. Each possibility represents a separate embodiment of the present invention.

In another embodiment, a constant temperature is maintained during growth of the culture. In another embodiment, the temperature is maintained at about 37° C. In another embodiment, the temperature is 37° C. In another embodiment, the temperature is 25° C. In another embodiment, the temperature is 27° C. In another embodiment, the temperature is 28° C. In another embodiment, the temperature is 30° C. In another embodiment, the temperature is 32° C. In another embodiment, the temperature is 34° C. In another embodiment, the temperature is 35° C. In another embodiment, the temperature is 36° C. In another embodiment, the temperature is 38° C. In another embodiment, the temperature is 39° C. Each possibility represents a separate embodiment of the present invention.

In another embodiment, a constant dissolved oxygen concentration is maintained during growth of the culture. In another embodiment, the dissolved oxygen concentration is maintained at 20% of saturation. In another embodiment, the concentration is 15% of saturation. In another embodiment, the concentration is 16% of saturation. In another embodiment, the concentration is 18% of saturation. In another embodiment, the concentration is 22% of saturation. In another embodiment, the concentration is 25% of saturation. In another embodiment, the concentration is 30% of saturation. In another embodiment, the concentration is 35% of saturation. In another embodiment, the concentration is 40% of saturation. In another embodiment, the concentration is 45% of saturation. In another embodiment, the concentration is 50% of saturation. In another embodiment, the concentration is 55% of saturation. In another embodiment, the concentration is 60% of saturation. In another embodiment, the concentration is 65% of saturation. In another embodiment, the concentration is 70% of saturation. In another embodiment, the concentration is 75% of saturation. In another embodiment, the concentration is 80% of saturation. In another embodiment, the concentration is 85% of saturation. In another embodiment, the concentration is 90% of saturation. In another embodiment, the concentration is 95% of saturation. In another embodiment, the concentration is 100% of saturation. In another embodiment, the concentration is near 100% of saturation. Each possibility represents a separate embodiment of the present invention.

In another embodiment of methods and compositions of the present invention, the Listeria culture is flash-frozen in liquid nitrogen, followed by storage at the final freezing temperature. In another embodiment, the culture is frozen in a more gradual manner; e.g. by placing in a vial of the culture in the final storage temperature. In another embodiment, the culture is frozen by any other method known in the art for freezing a bacterial culture. Each possibility represents a separate embodiment of the present invention.

In another embodiment of methods and compositions of the present invention, the storage temperature of the culture is between ⁻20 and ⁻80 degrees Celsius (° C.). In another embodiment, the temperature is significantly below ⁻20° C. In another embodiment, the temperature is not warmer than ⁻70° C. In another embodiment, the temperature is ⁻70° C. In another embodiment, the temperature is about ⁻70° C. In another embodiment, the temperature is ⁻20° C. In another embodiment, the temperature is about ⁻20° C. In another embodiment, the temperature is ⁻30° C. In another embodiment, the temperature is ⁻40° C. In another embodiment, the temperature is ⁻50° C. In another embodiment, the temperature is ⁻60° C. In another embodiment, the temperature is ⁻80° C. In another embodiment, the temperature is ⁻30-⁻70° C. In another embodiment, the temperature is ⁻40-⁻70° C. In another embodiment, the temperature is ⁻50-⁻70° C. In another embodiment, the temperature is ⁻60-⁻70° C. In another embodiment, the temperature is ⁻30-⁻80° C. In another embodiment, the temperature is ⁻40-⁻80° C. In another embodiment, the temperature is ⁻50-⁻80° C. In another embodiment, the temperature is ⁻60-⁻80° C. In another embodiment, the temperature is ⁻70-⁻80° C. In another embodiment, the temperature is colder than ⁻70° C. In another embodiment, the temperature is colder than ⁻80° C. Each possibility represents a separate embodiment of the present invention.

Methods for lyophilization and cryopreservation of recombinant Listeria strains are well known to those skilled in the art. Each possibility represents a separate embodiment of the present invention.

In one embodiment, “genetically fused” as provided herein is meant to result in a chimeric DNA containing, each in its own discrete embodiment, a promoter and a coding sequence that are not associated in nature.

In one embodiment, the “B-cell Receptors” or “BCR” is the cell-surface receptor of B cells for a specific antigen. In another embodiment, the BCR is composed of a transmembrane immunoglobulin molecule associated with the invariant Igα and Igβ chains in a noncovalent complex. In another embodiment, B-cell receptor (BCR) signaling regulates several B-cell fate decisions throughout development. In another embodiment, continued expression of the signaling subunits of the BCR is required for survival of mature B cells. In another embodiment, alterations in BCR signaling may support lymphomagenesis. In one embodiment, cells have the CD20 protein on the outside of the cell. In another embodiment, cancerous B cells also carry the CD20 protein. In another embodiment, CD20 is highly expressed in at least 95% of B-cell lymphomas. In one embodiment, the BCR is expressed in B-cell lymphomas. In another embodiment, the BCR is expressed in Follicular Lymphoma, Small Non-Cleaved Cell Lymphoma, Marginal Zone Lymphoma, Splenic Lymphoma with villous lymphocytes, Mantle Cell Lymphoma, Large Cell Lymphoma Diffuse large Cell Lymphoma, Small Lymphocytic Lymphoma, Endemic Burkitt's lymphoma, Sporadic Burkitt's lymphoma, Non-Burkitt's lymphoma, Mucosa-Associated Lymphoid Tissue MALT/MALToma (extranodal), Monocytoid B-cell, lymphoma (nodal), Diffuse Mixed Cell, Immunoblastic Lymphoma, Primary Mediastinal B-Cell Lymphoma, Angiocentric Lymphoma—Pulmonary B-Cell. In another embodiment, CD20 is expressed in the BCR is expressed in Follicular Lymphoma, Small Non-Cleaved Cell Lymphoma, Marginal Zone Lymphoma, Splenic Lymphoma with villous lymphocytes, Mantle Cell Lymphoma, Large Cell Lymphoma Diffuse large Cell Lymphoma, Small Lymphocytic Lymphoma, Endemic Burkitt's lymphoma, Sporadic Burkitt's lymphoma, Non-Burkitt's lymphoma, Mucosa-Associated Lymphoid Tissue MALT/MALToma (extranodal), Monocytoid B-cell, lymphoma (nodal), Diffuse Mixed Cell, Primary Mediastinal B-Cell Lymphoma, Angiocentric Lymphoma—Pulmonary B-Cell. Therefore, in one embodiment, the compositions and methods of the present invention comprising BCR are particularly useful in the prevention or treatment of the above-mentioned cancers.

In one embodiment, a major etiological factor in the genesis of cervical carcinoma is the infection by human papillomaviruses (HPVs), which, in one embodiment, are small DNA viruses that infect epithelial cells of either the skin or mucosa. In one embodiment, HPV related malignancies include oral, cervical, anogenital, and cervical cancers as well as respiratory papillomatsis. In one embodiment, HPV expresses six or seven non-structural proteins and two structural proteins, each of which may serve as a target in the immunoprophylactic or immunotherapeutic approaches described herein. In one embodiment, the viral capsid proteins L1 and L2 are late structural proteins. In one embodiment, L1 is the major capsid protein, the amino acid sequence of which is highly conserved among different HPV types.

In one embodiment, proteins E6 and E7 are two of seven early non-structural proteins, some of which play a role in virus replication (E1, E2, E4) and/or in virus maturation (E4). In another embodiment, proteins E6 and E7 are oncoproteins that are critical for viral replication, as well as for host cell immortalization and transformation. In one embodiment, E6 and E7 viral proteins are not expressed in normal cervical squamous epithelia. In another embodiment, the expression of the E6 and E7 genes in epithelial stem cells of the mucosa is required to initiate and maintain cervical carcinogenesis. Further and in some embodiments, the progression of pre-neoplastic lesions to invasive cervical cancers is associated with a continuous enhanced expression of the E6 and E7 oncoprotein. Thus, in another embodiment, E6 and E7 are expressed in cervical cancers. In another embodiment, the oncogenic potential of E6 and E7 may arise from their binding properties to host cell proteins. For example and in one embodiment, E6 binds to the tumor-suppressor protein p53 leading to ubiquitin-dependent degradation of the protein, and, in another embodiment, E7 binds and promotes degradation of the tumor-suppressor retinoblastoma protein (pRb). Therefore, in one embodiment, the compositions and methods of the present invention comprising HPV-E7 are particularly useful in the prevention or treatment of the above-mentioned cancers.

NY-ESO-1 is, in one embodiment, a “cancer-testis” antigen expressed in epithelial ovarian cancer (EOC). In another embodiment, NY-ESO-1 is expressed in metastatic melanoma, breast cancer, lung cancer, esophageal cancer, which in one embodiment, is esophageal squamous cell carcinoma, or a combination thereof. In one embodiment, NY-ESO-1 is one of the most immunogenic cancer testis antigens. In another embodiment NY-ESO-1 is able to induce strong humoral (antibody) and cellular (T cell) immune responses in patients with NY-ESO-1 expressing cancers either through natural or spontaneous induction by the patients tumor or following specific vaccination using defined peptide epitopes. In another embodiment, NY-ESO-1 peptide epitopes are presented by MHC class II molecules Therefore, in one embodiment, the compositions and methods of the present invention comprising NY-ESO-1 are particularly useful in the prevention or treatment of the above-mentioned cancers.

EXPERIMENTAL DETAILS SECTION Example 1 LLO-Antigen Fusions Induce Anti-Tumor Immunity Materials and Experimental Methods (Examples 1-2)

Cell Lines

The C57BL/6 syngeneic TC-1 tumor was immortalized with HPV-16 E6 and E7 and transformed with the c-Ha-ras oncogene. TC-1 expresses low levels of E6 and E7 and is highly tumorigenic. TC-1 was grown in RPMI 1640, 10% FCS, 2 mM L-glutamine, 100 U/ml penicillin, 100 μg/ml streptomycin, 100 μM nonessential amino acids, 1 mM sodium pyruvate, 50 micromolar (mcM) 2-ME, 400 microgram (mcg)/ml G418, and 10% National Collection Type Culture-109 medium at 37° with 10% CO₂. C3 is a mouse embryo cell from C57BL/6 mice immortalized with the complete genome of HPV 16 and transformed with pEJ-ras. EL-4/E7 is the thymoma EL-4 retrovirally transduced with E7.

L. monocytogenes Strains and Propagation

Listeria strains used were Lm-LLO-E7 (hly-E7 fusion gene in an episomal expression system; FIG. 1A), Lm-E7 (single-copy E7 gene cassette integrated into Listeria genome), Lm-LLO-NP (“DP-L2028”; hly-NP fusion gene in an episomal expression system), and Lm-Gag (“ZY-18”; single-copy HIV-1 Gag gene cassette integrated into the chromosome). E7 was amplified by PCR using the primers 5′-GGCTCGAGCATGGAGATACACC-3′ (SEQ ID NO: 38; XhoI site is underlined) and 5′-GGGGACTAGTTTATGGTTTCTGAGAACA-3′ (SEQ ID NO: 39; SpeI site is underlined) and ligated into pCR2.1 (Invitrogen, San Diego, Calif.). E7 was excised from pCR2.1 by XhoI/SpeI digestion and ligated into pGG-55. The hly-E7 fusion gene and the pluripotential transcription factor prfA were cloned into pAM401, a multicopy shuttle plasmid (Wirth R et al, J Bacteriol, 165: 831, 1986), generating pGG-55. The hly promoter drives the expression of the first 441 AA of the hly gene product, (lacking the hemolytic C-terminus, referred to below as “ΔLLO,” and having the sequence set forth in SEQ ID NO: 17), which is joined by the XhoI site to the E7 gene, yielding a hly-E7 fusion gene that is transcribed and secreted as LLO-E7. Transformation of a prfA negative strain of Listeria, XFL-7 (provided by Dr. Hao Shen, University of Pennsylvania), with pGG-55 selected for the retention of the plasmid in vivo (FIGS. 1A-B). The hly promoter and gene fragment were generated using primers 5′-GGGGGCTAGCCCTCCTTTGATTAGTATATTC-3′ (SEQ ID NO: 40; NheI site is underlined) and 5′-CTCCCTCGAGATCATAATTTACTTCATC-3′ (SEQ ID NO: 41; XhoI site is underlined). The prfA gene was PCR amplified using primers 5′-GACTACAAGGACGATGACCGACAAGTGATAACCCGGGATCTAAATAAATCCGTT T-3′ (SEQ ID NO: 42; XbaI site is underlined) and 5′-CCCGTCGACCAGCTCTTCTTGGTGAAG-3′ (SEQ ID NO: 43; SalI site is underlined). Lm-E7 was generated by introducing an expression cassette containing the hly promoter and signal sequence driving the expression and secretion of E7 into the orfZ domain of the LM genome. E7 was amplified by PCR using the primers 5′-GCGGATCCCATGGAGATACACCTAC-3′ (SEQ ID NO: 44; BamHI site is underlined) and 5′-GCTCTAGATTATGGTTTCTGAG-3′ (SEQ ID NO: 45; XbaI site is underlined). E7 was then ligated into the pZY-21 shuttle vector. LM strain 10403S was transformed with the resulting plasmid, pZY-21-E7, which includes an expression cassette inserted in the middle of a 1.6-kb sequence that corresponds to the orfX, Y, Z domain of the LM genome. The homology domain allows for insertion of the E7 gene cassette into the orfZ domain by homologous recombination. Clones were screened for integration of the E7 gene cassette into the orfZ domain. Bacteria were grown in brain heart infusion medium with (Lm-LLO-E7 and Lm-LLO-NP) or without (Lm-E7 and ZY-18) chloramphenicol (20 μg/ml). Bacteria were frozen in aliquots at −80° C. Expression was verified by Western blotting (FIG. 2)

Western Blotting

Listeria strains were grown in Luria-Bertoni medium at 37° C. and were harvested at the same optical density measured at 600 nm. The supernatants were TCA precipitated and resuspended in 1× sample buffer supplemented with 0.1 N NaOH. Identical amounts of each cell pellet or each TCA-precipitated supernatant were loaded on 4-20% Tris-glycine SDS-PAGE gels (NOVEX, San Diego, Calif.). The gels were transferred to polyvinylidene difluoride and probed with an anti-E7 monoclonal antibody (mAb) (Zymed Laboratories, South San Francisco, Calif.), then incubated with HRP-conjugated anti-mouse secondary Ab (Amersham Pharmacia Biotech, Little Chalfont, U.K.), developed with Amersham ECL detection reagents, and exposed to Hyperfilm (Amersham Pharmacia Biotech).

Measurement of Tumor Growth

Tumors were measured every other day with calipers spanning the shortest and longest surface diameters. The mean of these two measurements was plotted as the mean tumor diameter in millimeters against various time points. Mice were sacrificed when the tumor diameter reached 20 mm. Tumor measurements for each time point are shown only for surviving mice.

Effects of Listeria Recombinants on Established Tumor Growth

Six- to 8-wk-old C57BL/6 mice (Charles River) received 2×10⁵ TC-1 cells s.c. on the left flank. One week following tumor inoculation, the tumors had reached a palpable size of 4-5 mm in diameter. Groups of eight mice were then treated with 0.1 LD₅₀ i.p. Lm-LLO-E7 (10⁷ CFU), Lm-E7 (10⁶ CFU), Lm-LLO-NP (10⁷ CFU), or Lm-Gag (5×10⁵ CFU) on days 7 and 14.

⁵¹Cr Release Assay

C57BL/6 mice, 6-8 wk old, were immunized i.p. with 0.1LD₅₀ Lm-LLO-E7, Lm-E7, Lm-LLO-NP, or Lm-Gag. Ten days post-immunization, spleens were harvested. Splenocytes were established in culture with irradiated TC-1 cells (100:1, splenocytes:TC-1) as feeder cells; stimulated in vitro for 5 days, then used in a standard ⁵¹Cr release assay, using the following targets: EL-4, EL-4/E7, or EL-4 pulsed with E7 H-2b peptide (RAHYNIVTF; SEQ ID NO: 19). E:T cell ratios, performed in triplicate, were 80:1, 40:1, 20:1, 10:1, 5:1, and 2.5:1. Following a 4-h incubation at 37° C., cells were pelleted, and 50 μl supernatant was removed from each well. Samples were assayed with a Wallac 1450 scintillation counter (Gaithersburg, Md.). The percent specific lysis was determined as [(experimental counts per minute−spontaneous counts per minute)/(total counts per minute−spontaneous counts per minute)]×100.

TC-1-Specific Proliferation

C57BL/6 mice were immunized with 0.1 LD₅₀ and boosted by i.p. injection 20 days later with 1 LD₅₀ Lm-LLO-E7, Lm-E7, Lm-LLO-NP, or Lm-Gag. Six days after boosting, spleens were harvested from immunized and naive mice. Splenocytes were established in culture at 5×10⁵/well in flat-bottom 96-well plates with 2.5×10⁴, 1.25×10⁴, 6×10³, or 3×10³ irradiated TC-1 cells/well as a source of E7 Ag, or without TC-1 cells or with 10 μg/ml Con A. Cells were pulsed 45 h later with 0.5 μCi [³H]thymidine/well. Plates were harvested 18 h later using a Tomtec harvester 96 (Orange, Conn.), and proliferation was assessed with a Wallac 1450 scintillation counter. The change in counts per minute was calculated as experimental counts per minute−no Ag counts per minute.

Flow Cytometric Analysis

C57BL/6 mice were immunized intravenously (i.v.) with 0.1 LD₅₀ Lm-LLO-E7 or Lm-E7 and boosted 30 days later. Three-color flow cytometry for CD8 (53-6.7, PE conjugated), CD62 ligand (CD62L; MEL-14, APC conjugated), and E7 H-2 Db tetramer was performed using a FACSCalibur® flow cytometer with CellQuest® software (Becton Dickinson, Mountain View, Calif.). Splenocytes harvested 5 days after the boost were stained at room temperature (rt) with H-2 Db tetramers loaded with the E7 peptide (RAHYNIVTF; SEQ ID NO: 19) or a control (HIV-Gag) peptide. Tetramers were used at a 1/200 dilution and were provided by Dr. Larry R. Pease (Mayo Clinic, Rochester, Minn.) and by the National Institute of Allergy and Infectious Diseases Tetramer Core Facility and the National Institutes of Health AIDS Research and Reference Reagent Program. Tetramer⁺, CD8⁺, CD62L^(low) cells were analyzed.

Depletion of Specific Immune Components

CD8⁺ cells, CD4⁺ cells and IFN were depleted in TC-1-bearing mice by injecting the mice with 0.5 mg per mouse of mAb: 2.43, GK1.5, or xmg1.2, respectively, on days 6, 7, 8, 10, 12, and 14 post-tumor challenge. CD4⁺ and CD8⁺ cell populations were reduced by 99% (flow cytometric analysis). CD25⁺ cells were depleted by i.p. injection of 0.5 mg/mouse anti-CD25 mAb (PC61, provided by Andrew J. Caton) on days 4 and 6. TGF was depleted by i.p. injection of the anti-TGF-mAb (2G7, provided by H. I. Levitsky), into TC-1-bearing mice on days 6, 7, 8, 10, 12, 14, 16, 18, and 20. Mice were treated with 10⁷ Lm-LLO-E7 or Lm-E7 on day 7 following tumor challenge.

Adoptive Transfer

Donor C57BL/6 mice were immunized and boosted 7 days later with 0.1 LD₅₀ Lm-E7 or Lm-Gag. The donor splenocytes were harvested and passed over nylon wool columns to enrich for T cells. CD8⁺ T cells were depleted in vitro by incubating with 0.1 μg 2.43 anti-CD8 mAb for 30 min at rt. The labeled cells were then treated with rabbit complement. The donor splenocytes were >60% CD4⁺ T cells (flow cytometric analysis). TC-1 tumor-bearing recipient mice were immunized with 0.1 LD₅₀ 7 days post-tumor challenge. CD4⁺-enriched donor splenocytes (10⁷) were transferred 9 days after tumor challenge to recipient mice by i.v. injection.

B16F0-Ova Experiment

24 C57BL/6 mice were inoculated with 5×10⁵ B16F0-Ova cells. On days 3, 10 and 17, groups of 8 mice were immunized with 0.1 LD₅₀ Lm-OVA (10⁶ cfu), Lm-LLO-OVA (10⁸ cfu) and eight animals were left untreated.

Statistics

For comparisons of tumor diameters, mean and SD of tumor size for each group were determined, and statistical significance was determined by Student's t test. p≦0.05 was considered significant.

Results

Lm-E7 and Lm-LLO-E7 were compared for their abilities to impact on TC-1 growth. Subcutaneous tumors were established on the left flank of C57BL/6 mice. Seven days later tumors had reached a palpable size (4-5 mm). Mice were vaccinated on days 7 and 14 with 0.1 LD₅₀ Lm-E7, Lm-LLO-E7, or, as controls, Lm-Gag and Lm-LLO-NP. Lm-LLO-E7 induced complete regression of 75% of established TC-1 tumors, while the other 2 mice in the group controlled their tumor growth (FIG. 3A). By contrast, immunization Lm-E7 and Lm-Gag did not induce tumor regression. This experiment was repeated multiple times, always with very similar results. In addition, similar results were achieved for Lm-LLO-E7 under different immunization protocols. In another experiment, a single immunization was able to cure mice of established 5 mm TC-1 tumors.

In other experiments, similar results were obtained with two other E7-expressing tumor cell lines: C3 and EL-4/E7. To confirm the efficacy of vaccination with Lm-LLO-E7, animals that had eliminated their tumors were re-challenged with TC-1 or EL-4/E7 tumor cells on day 60 or day 40, respectively Animals immunized with Lm-LLO-E7 remained tumor free until termination of the experiment (day 124 in the case of TC-1 and day 54 for EL-4/E7).

A similar experiment was performed with the chicken ovalbumin antigen (OVA). Mice were immunized with either Lm-OVA or Lm-LLO-OVA, then challenged with either an EL-4 thymoma engineered to express OVA or the very aggressive murine melanoma cell line B16F0-Ova, which has very low MHC class I expression. In both cases, Lm-LLO-OVA, but not Lm-OVA, induced the regression of established tumors. For example, at the end of the B16F0 experiment (day 25), all the mice in the naive group and the Lm-OVA group had died. All the Lm-LLO-OVA mice were alive, and 50% of them were tumor free. (FIG. 3B).

Thus, expression of an antigen gene as a fusion protein with ALLO enhances the immunogenicity of the antigen.

Example 2 Lm-LLO-E7 Treatment Elicits TC-1 Specific Splenocyte Proliferation

To measure induction of T cells by Lm-E7 with Lm-LLO-E7, TC-1-specific proliferative responses of splenocytes from rLm-immunized mice, a measure of antigen-specific immunocompetence, were assessed. Splenocytes from Lm-LLO-E7-immunized mice proliferated when exposed to irradiated TC-1 cells as a source of E7, at splenocyte: TC-1 ratios of 20:1, 40:1, 80:1, and 160:1 (FIG. 4). Conversely, splenocytes from Lm-E7 and rLm control immunized mice exhibited only background levels of proliferation.

Example 3 Fusion of NP to LLO Enhances its Immunogenicity Materials and Experimental Methods

Lm-LLO-NP was prepared as depicted in FIG. 1, except that influenza nucleoprotein (NP) replaced E7 as the antigen. 32 BALB/c mice were inoculated with 5×10⁵ RENCA-NP tumor cells. RENCA-NP is a renal cell carcinoma retrovirally transduced with influenza nucleoprotein NP (described in U.S. Pat. No. 5,830,702, which is incorporated herein by reference). After palpable macroscopic tumors had grown on day 10, eight animals in each group were immunized i.p. with 0.1 LD₅₀ of the respective Listeria vector. The animals received a second immunization one week later.

Results

In order to confirm the generality of the finding that fusing LLO to an antigen confers enhanced immunity, Lm-LLO-NP and Lm-NP (similar to the Lm-E7 vectors) were constructed, and the vectors were compared for ability to induce tumor regression, with Lm-Gag (isogenic with Lm-NP except for the antigen expressed) as a negative control. As depicted in FIG. 5, 6/8 of the mice that received Lm-LLO-NP were tumor free. By contrast, only 1/8 and 2/8 mice in the Lm-Gag and Lm-NP groups, respectively, were tumor free. All the mice in the naive group had large tumors or had died by day 40. Thus, enhancement of immunogenicity of an antigen by fusion to LLO is not restricted to E7, but rather is a general phenomenon.

Example 4 Enhancement of Immunogenicity by Fusion of an Antigen to LLO does not Require a Listeria Vector Materials and Experimental Methods

Construction of Vac-SigE7Lamp

The WR strain of vaccinia was used as the recipient and the fusion gene was excised from the Listerial plasmid and inserted into pSC11 under the control of the p75 promoter. This vector was chosen because it is the transfer vector used for the vaccinia constructs Vac-SigE7Lamp and Vac-E7 and would therefore allow direct comparison with Vac-LLO-E7. In this way all three vaccinia recombinants would be expressed under control of the same early/late compound promoter p7.5. In addition, SC11 allows the selection of recombinant viral plaques to TK selection and beta-galactosidase screening. FIG. 6 depicts the various vaccinia constructs used in these experiments. Vac-SigE7Lamp is a recombinant vaccinia virus that expressed the E7 protein fused between lysosomal associated membrane protein (LAMP-1) signal sequence and sequence from the cytoplasmic tail of LAMP-1. It was designed to facilitate the targeting of the antigen to the MHC class II pathway.

The following modifications were made to allow expression of the gene product by vaccinia: (a) the T5XT sequence that prevents early transcription by vaccinia was removed from the 5′ portion of the LLO-E7 sequence by PCR; and (b) an additional XmaI restriction site was introduced by PCR to allow the final insertion of LLO-E7 into SC11. Successful introduction of these changes (without loss of the original sequence that encodes for LLO-E7) was verified by sequencing. The resultant pSC1 1-E7 construct was used to transfect the TK-ve cell line CV1 that had been infected with the wild-type vaccinia strain, WR. Cell lysates obtained from this co-infection/transfection step contain vaccinia recombinants that were plaque-purified 3 times. Expression of the LLO-E7 fusion product by plaque purified vaccinia was verified by Western blot using an antibody directed against the LLO protein sequence. In addition, the ability of Vac-LLO-E7 to produce CD8⁺ T cells specific to LLO and E7 was determined using the LLO (91-99) and E7 (49-57) epitopes of Balb/c and C57/BL6 mice, respectively. Results were confirmed in a chromium release assay.

Results

To determine whether enhancement of immunogenicity by fusion of an antigen to LLO requires a Listeria vector, a vaccinia vector expressing E7 as a fusion protein with a non-hemolytic truncated form of LLO (ΔLLO) was constructed. Tumor rejection studies were performed with TC-1 following the protocol described for Example 1. Two experiments were performed with differing delays before treatment was started. In one experiment, treatments were initiated when the tumors were about 3 mm in diameter (FIG. 7). As of day 76, 50% of the Vac-LLO-E7 treated mice were tumor free, while only 25% of the Vac-SigE7Lamp mice were tumor free. In other experiments, ALLO-antigen fusions were more immunogenic than E7 peptide mixed with SBAS2 or unmethylated CpG oligonucleotides in a side-by-side comparison.

These results show that (a) fusion of ΔLLO-antigen fusions are immunogenic not only in the context of Listeria, but also in other contexts; and (b) the immunogenicity of ΔLLO-antigen fusions compares favorably with other accepted vaccine approaches.

Example 5 Site-Directed Mutagenesis of the LLO Cholesterol-Binding Domain

Site-directed mutagenesis was performed on LLO to introduce inactivating point mutations in the CBD, using the following strategy. The resulting protein is termed “mutLLO”:

Subcloning of LLO into pET29b

The amino acid sequence of wild-type LLO is:

MKKIMLVFITLILVSLPIAQQTEAKDASAFNKENSISSVAPPASPPASPKTPIEK KHADEIDKYIQGLDYNKNNVLVYHGDAVTNVPPRKGYKDGNEYIVVEKKKKSINQN NADIQVVNAISSLTYPGALVKANSELVENQPDVLPVKRDSLTLSIDLPGMTNQDNKIV VKNATKSNVNNAVNTLVERWNEKYAQAYSNVSAKIDYDDEMAYSESQLIAKFGTA FKAVNNSLNVNFGAISEGKMQEEVISFKQIYYNVNVNEPTRPSRFFGKAVTKEQLQA LGVNAENPPAYISSVAYGRQVYLKLSTNSHSTKVKAAFDAAVSGKSVSGDVELTNII KNSSFKAVIYGGSAKDEVQIIDGNLGDLRDILKKGATFNRETPGVPIAYTTNFLKDNE LAVIKNNSEYIETTSKAYTDGKINIDHSGGYVAQFNISWDEVNYDPEGNEIVQHKNW SENNKSKLAHFTSSIYLPGNARNINVYAKECTGLAWEWWRTVIDDRNLPLVKNRNISI WGTTLYPKYSNKVDNPIE (SEQ ID NO: 46). The signal peptide and the cholesterol-binding domain (CBD) are underlined, with 3 critical residues in the CBD (C484, W491, and W492) in bold-italics.

A 6×His tag (HHHHHH) was added to the C-terminal region of LLO. The amino acid sequence of His-tagged LLO is: MKKIMLVFITLILVSLPIAQQTEAKDASAFNKENSISSVAPPASPPASPKTPIEKKHADEI DKYIQGLDYNKNNVLVYHGDAVTNVPPRKGYKDGNEYIVVEKKKKSINQNNADIQV VNAISSLTYPGALVKANSELVENQPDVLPVKRDSLTLSIDLPGMTNQDNKIVVKNAT KSNVNNAVNTLVERWNEKYAQAYSNVSAKIDYDDEMAYSESQLIAKFGTAFKAVN NSLNVNFGAISEGKMQEEVISFKQIYYNVNVNEPTRPSRFFGKAVTKEQLQALGVNA ENPPAYISSVAYGRQVYLKLSTNSHSTKVKAAFDAAVSGKSVSGDVELTNIIKNSSFK AVIYGGSAKDEVQIIDGNLGDLRDILKKGATFNRETPGVPIAYTTNFLKDNELAVIKN NSEYIETTSKAYTDGKINIDHSGGYVAQFNISWDEVNYDPEGNEIVQHKNWSENNKS KLAHFTSSIYLPGNARNINVYAKECTGLAWEWWRTVIDDRNLPLVKNRNISIWGTTL YPKYSNKVDNPIEHHHHHH (SEQ ID NO: 47).

A gene encoding a His-tagged LLO protein was digested with NdeI/BamHI, and the NdeI/BamHI was subcloned into the expression vector pET29b, between the NdeI and BamHI sites. The sequence of the gene encoding the LLO protein is:

catatgaaggatgcatctgcattcaataaagaaaattcaatttcatccgtggcaccaccagcatctccgcctgcaagtccta agacgccaatcgaaaagaaacacgcggatgaaatcgataagtatatacaaggattggattacaataaaaacaatgtattagtataccac ggagatgcagtgacaaatgtgccgccaagaaaaggttacaaagatggaaatgaatatattgttgtggagaaaaagaagaaatccatca atcaaaataatgcagacattcaagttgtgaatgcaatttcgagcctaacctatccaggtgctctcgtaaaagcgaattcggaattagtaga aaatcaaccagatgttctccctgtaaaacgtgattcattaacactcagcattgatttgccaggtatgactaatcaagacaataaaatagttgt aaaaaatgccactaaatcaaacgttaacaacgcagtaaatacattagtggaaagatggaatgaaaaatatgctcaagcttattcaaatgta agtgcaaaaattgattatgatgacgaaatggcttacagtgaatcacaattaattgcgaaatttggtacagcatttaaagctgtaaataatag cttgaatgtaaacttcggcgcaatcagtgaagggaaaatgcaagaagaagtcattagttttaaacaaatttactataacgtgaatgttaatg aacctacaagaccttccagatttttcggcaaagctgttactaaagagcagttgcaagcgcttggagtgaatgcagaaaatcctcctgcat atatctcaagtgtggcgtatggccgtcaagtttatttgaaattatcaactaattcccatagtactaaagtaaaagctgcttttgatgctgccgt aagcggaaaatctgtctcaggtgatgtagaactaacaaatatcatcaaaaattcttccttcaaagccgtaatttacggaggttccgcaaaa gatgaagttcaaatcatcgacggcaacctcggagacttacgcgatattttgaaaaaaggcgctacttttaatcgagaaacaccaggagtt cccattgcttatacaacaaacttcctaaaagacaatgaattagctgttattaaaaacaactcagaatatattgaaacaacttcaaaagcttat acagatggaaaaattaacatcgatcactctggaggatacgttgctcaattcaacatttcttgggatgaagtaaattatgatcctgaaggtaa cgaaattgttcaacataaaaactggagcgaaaacaataaaagcaagctagctcatttcacatcgtccatctatttgcctggtaacgcgag aaatattaatgtttacgctaaagaatgcactggtttagcttgggaatggtggagaacggtaattgatgaccggaacttaccacttgtgaaa aatagaaatatctccatctggggcaccacgctttatccgaaatatagtaataaagtagataatccaatcgaacaccaccaccaccaccac taataaggatcc (SEQ ID NO: 48). The underlined sequences are, starting from the beginning of the sequence, the NdeI site, the NheI site, the CBG-encoding region, the 6×His tag, and the BamHI site. The CBD resides to be mutated in the next step are in bold-italics.

Splicing by Overlap Extension (SOE) PCR

Step 1: PCR reactions #1 and #2 were performed on the pET29b-LLO template. PCR reaction #1, utilizing primers #1 and #2, amplified the fragment between the NheI site and the CBD, inclusive, introducing a mutation into the CBD. PCR reaction #2, utilizing primers #3 and #4, amplified the fragment between the CBD and the BamHI site, inclusive, introducing the same mutation into the CBD (FIG. 8A).

PCR reaction #1 cycle: A) 94° C. 2 min 30 sec, B) 94° C. 30 sec, C) 55° C. 30 sec, D) 72° C. 1 min, Repeat steps B to D 29 times (30 cycles total), E) 72° C. 10 min

PCR reaction #2 cycle: A) 94° C. 2 min30 sec, B) 94° C. 30 sec, C) 60° C. 30 sec, D) 72° C. 1 min, Repeat steps B to D 29 times (30 cycles total), E) 72° C. 10 min

Step 2: The products of PCR reactions #1 and #2 were mixed, allowed to anneal (at the mutated CBD-encoding region), and PCR was performed with primers #1 and #4 for 25 more cycles (FIG. 8B). PCR reaction cycle: A) 94° C. 2 min 30 sec, B) 94° C. 30 sec, C) 72° C. 1 min, Repeat steps B to C 9 times (10 cycles total), Add primers #1 and #4, D) 94° C. 30 sec, E) 55° C. 30 sec, F) 72° C. 1 min, Repeat steps D to F 24 times (25 cycles total), G) 72° C. 10 min.

Primer sequences:

Primer 1: GCTAGCTCATTTCACATCGT (SEQ ID NO: 49; NheI sequence is underlined).

Primer 2: TCTTGCAGCTTCCCAAGCTAAACCAGTCGCTTCTTTAGCGTAAACATTAATATT (SEQ ID NO: 50; CBD-encoding sequence is underlined; mutated codons are in bold-italics).

Primer 3: GAAGCGACTGGTTTAGCTTGGGAAGCTGCAAGAACGGTAATTGATGACCGGAAC (SEQ ID NO: 51; CBD-encoding sequence is underlined; mutated codons are in bold-italics).

Primer 4: GGATCCTTATTAGTGGTGGTGGTGGTGGTGTTCGATTGG (SEQ ID NO: 52; BamHI sequence is underlined).

The wild-type CBD sequence is ECTGLAWEWWR (SEQ ID NO: 18).

The mutated CBD sequence is EATGLAWEAAR (SEQ ID NO: 53).

The sequence of the mutated NheI-BamHI fragment is

(SEQ ID NO: 54) GCTAGCTCATTTCACATCGTCCATCTATTTGCCTGGTAACGCGAGAAATA TTAATGTTTACGCTAAAGAA

ACTGGTTTAGCTTGGGAA

AGA ACGGTAATTGATGACCGGAACTTACCACTTGTGAAAAATAGAAATATCTC CATCTGGGGCACCACGCTTTATCCGAAATATAGTAATAAAGTAGATAATC CAATCGAACACCACCACCACCACCACTAATAAGGATCC.

Example 6 Replacement of Part of the LLO CBD with a CTL Epitope

Site-directed mutagenesis was performed on LLO to replace 9 amino acids (AA) of the CBD with a CTL epitope from the antigen NY-ESO-1. The sequence of the CBD (SEQ ID NO: 18) was replaced with the sequence ESLLMWITQCR (SEQ ID NO: 55; mutated residues underlined), which contains the HLA-A2 restricted epitope 157-165 from NY-ESO-1, termed “ctLLO.”

The subcloning strategy used was similar to the previous Example.

The primers used were as follows:

Primer 1: GCTAGCTCATTTCACATCGT (SEQ ID NO: 56; NheI sequence is underlined).

Primer 2: TCTGCACTGGGTGATCCACATCAGCAGGCTTTCTTTAGCGTAAACATTAATATT (SEQ ID NO: 57; CBD-encoding sequence is underlined; mutated (NY-ESO-1) codons are in bold-italics).

Primer 3: GAAAGCCTGCTGATGTGGATCACCCAGTGCAGAACGGTAATTGATGACCGGAAC (SEQ ID NO: 58; CBD-encoding sequence is underlined; mutated (NY-ESO-1) codons are in bold-italics).

Primer 4: GGATCCTTATTAGTGGTGGTGGTGGTGGTGTTCGATTGG (SEQ ID NO: 59; BamHI sequence is underlined).

The sequence of the resulting NheI/BamHI fragment is as follows:

(SEQ ID NO: 60) GCTAGCTCATTTCACATCGTCCATCTATTTGCCTGGTAACGCGAGAAATA TTAATGTTTACGCTAAAGAA

AGAACGGTAATTGATGACCGGAACTTACCACTTGTGAAAAATAGAAATAT CTCCATCTGGGGCACCACGCTTTATCCGAAATATAGTAATAAAGTAGATA ATCCAATCGAACACCACCACCACCACCACTAATAAGGATCC.

Example 7 mutLLO and ctLLO are Able to be Expressed and Purified in E. coli Expression Systems

To show that mutLLO and ctLLO could be expressed in E. coli, E. coli were transformed with pET29b and induced with 0.5 mM IPTG, then cell lysates were harvested 4 hours later and the total proteins were separated in a SDS-PAGE gel and subject to Coomassie staining (FIG. 9A) and anti-LLO Western blot, using monoclonal antibody B3-19 (FIG. 9B). Thus, LLO proteins containing point mutations or substitutions in the CBD can be expressed and purified in E. coli expression systems.

Example 8 mutLLO and ctLLO Exhibit Significant Reduction in Hemolytic Activity Materials and Experimental Methods

Hemolysis Assay

1. Wild-type and mutated LLO were diluted to the dilutions indicated in FIGS. 10A-B in 900 μl of 1×PBS-cysteine (PBS adjusted to pH 5.5 with 0.5 M Cysteine hydrochloride or was adjusted to 7.4). 2. LLO was activated by incubating at 37° C. for 30 minutes. 3. Sheep red blood cells (200 μl/sample) were washed twice in PBS-cysteine and 3 to 5 times in 1×PBS until the supernatant was relatively clear. 4. The final pellet of sheep red blood cells was resuspended in PBS-cysteine and 100 μl of the cell suspension was added to the 900 μl of the LLO solution (10% final solution). 5. 50 μl of sheep red blood cells was added to 950 μl of water+10% Tween 20 (Positive control for lysis, will contain 50% the amount of lysed cells as the total amount of cells add to the other tubes; “50% control.”) 6. All tubes were mixed gently and incubated at 37° C. for 45 minutes. 7. Red blood cells were centrifuged in a microcentrifuge for 10 minutes at 1500 rpm. 8. A 200 μl aliquot of the supernatant was transferred to 96-well ELISA plate and read at 570 nm to measure the concentration of released hemoglobin after hemolysis, and samples were titered according to the 50% control.

Results

The hemolytic activity of mutLLO and ctLLO was determined using a sheep red blood cell assay. mutLLO exhibited significantly reduced (between 100-fold and 1000-fold) hemolytic titer at pH 5.5, and undetectable hemolytic activity at pH 7.4. ctLLO exhibited undetectable hemolytic activity at either pH (FIGS. 10A-B).

Thus, point (mutLLO) or substitution (ctLLO) mutation of LLO CBD residues, including C484, W491, and W492, abolishes or severely reduces hemolytic activity. Further, replacement of the CBD with a heterologous antigenic peptide is an effective means of creating an immunogenic carrier of a heterologous epitope, with significantly reduced hemolytic activity relative to wild-type LLO.

Example 9 Expression of the 38C13 BCR as an scFv Protein

A modified pUC119 plasmid was utilized to express the scFv protein in E. coli (Sure® strain, Statagene, La Jolla, Calif.). The plasmid contained the 38C13 scFv DNA (provided by Dr. Ronald Levy, Stanford University), sequences coding for the bacterial leader pelB (facilitates secretion of the protein into the periplasmic space) and the human c-myc peptide tag, which aids detection of protein expression in E. coli and purification of the tumor antigen. The 38C13 VH sequence starts with the Gly residue encoded by residues 133-135 and ends with the Val residue encoded by residues 478-480. The 38C13 VK sequence starts with the Glu residue encoded by residues 538-540). The 38C13 VK has a myc tag on the end; the VK ends with a Lys (encoded by residues 848-850).

The relevant fragment of the plasmid had the following sequence:

(SEQ ID NO: 61) gcccagccgccatgccaggtgaagctgcaggagtcaggaggaggcttggtccagcctgggggttctctgagtctctcctgtgcagctt ctggattcaccttcactgattactacatgagctgggtccgccagcctccagggaaggcacttgagtggttggctttgattagaaacaaag ctaatggttacacagagtacagtgcatctgtgaagggtcggttcaccatctccagagataattcccaaagcatcctctatcttcaaatgaat gccctgagagctgaggacagtgccacttattactgtgcaagagatcccaattactacgatggtagctacgaagggtactttgactactgg ggccaagggaccacggtcaccgtctcctcaggcggaggcggttcaggcggaggtggctctggcggtggcggatcggacattgagc tcacccagtctccatcctcactgtctgcatctctgggaggcaaagtcaccatcacttgcaaggcaagccaagacattaacaagtatatag cttggtaccaacacaagcctggaaaaggtcctaggctgctcatacattacacatctacattacagccaggcatcccatcaaggttcagtg gaagtgggtctgggagagattattccttcagcatcagcaacctggagcctgaagatattgcaacttattattgtctacagtatgataatctgt acacgttcggctcggggaccaagctggaaataaaacgggcggccgcagaacaaaaactcatctcagaagaggatctgaattaataag aattc.

The encoded protein had the sequence:

(SEQ ID NO: 62) MKYLLPTAAAGLLLLAAQPAQPPCQVKLQESGGGLVQPGGSLSLSCAASGFTFTDYY MSWVRQPPGKALEWLALIRNKANGYTEYSASVKGRFTISRDNSQSILYLQMNALRAE DSATYYCARDPNYYDGSYEGYFDYWGQGTTVTVSSGGGGSGGGGSGGGGSDIELTQ SPSSLSASLGGKVTITCKASQDINKYIAWYQHKPGKGPRLLIHYTSTLQPGIPSRFSGSG SGRDYSFSISNLEPEDIATYYCLQYDNLYTFGSGTKLEIKRAAAEQKLISEEDLN.

Initially, the 38C13 plasmid was transformed into the E. coli strain BL21*. Following IPTG-induction, the BL21* cells expressed the recombinant protein, with a minor fraction present in the periplasmic space, and the majority present in the E. coli inclusion bodies. The inclusion bodies were solubilized (at <80 mcg/ml total protein) in 6M guanidine; the solubilized proteins were refolded in the presence of L-arginine, oxidized glutathione, and EDTA at 10° C. for 3-5 days. The refolded 38scFv protein was then purified from other proteins on an immuno-affinity column containing the S1C5 antibody (anti-38C13 BCR clone) linked to CNBr sepharose using the Amino-Link® kit (Pierce Endogen).

To increase the yield, recombinant protein was recovered from soluble protein extracts. Induction of 38C13scFv expression and recovery of soluble versus insoluble protein at 20° C. and 30° C. were compared. Greater yields of soluble 38C13scFv were recovered by induction at 20° C. Furthermore, maximal yield of soluble protein in the culture supernatant (SN) or from cells was achieved when 0.5% glycine or 1% TX-100 was included in the induction medium. Finally, a 1-liter induction culture performed in medium containing 0.5% glycine and 1% TX-100 yielded 2.34 mg pure soluble 38C13scFv following affinity chromatography (FIG. 11). The overall strategy for production of scFV tumor antigen is summarized in FIG. 12.

Example 10 Verification of 38C13 scFv Conformational Integrity by ELISA

To verify that correctly folded 38C13scFv protein was produced by the above method, an ELISA assay was developed. Using serial dilutions of purified 38C13scFv protein, a standard curve was established. This assay showed that correctly folded 38C13scFv protein was produced (FIG. 13). This ELISA assay can also be used to quantitate correctly folded soluble protein in induction media as well as cell protein extracts, for further optimization of conditions for producing 38C13scFv protein.

Production of Non-Hemolytic LLO:

LLO was rendered non-hemolytic by conjugation to 38C13 BCR with aldehyde. The E. coli LLO/pET29 plasmid was obtained from Dr. Margaret Gedde (Gedde M M, Higgins D E, Tilney L G, Portnoy D A. Role of listeriolysin 0 in cell-to-cell spread of Listeria monocytogenes. Infect Immun. 2000 February; 68(2):999-1003) which has a (HIS)₆ tag at the 3′ end The E. coli strain BL21* was transformed with LLO/pET29 plasmid by temperature shock and the bacteria plated onto selection medium. Colonies were selected and the BL21*/LLO/pet29 were cultured in LB medium at 37° C. in an incubator shaker until plateau phase. Cell aliquots were then frozen in LB/glycerol at −20° C. When induction expression was to be performed, the frozen BL21*/LLO/pet29 were streaked onto agar selection plates, plates were incubated overnight at 37° C., colonies selected and grown in LB broth with kanamycin and chloramphenicol. The culture was then incubated at 30° C. in an incubator shaker until the OD₆₀₀=0.6-0.7, at this point IPTG (1 mM final concentration) was added to the culture and incubated for a further 8 hours. The LB broth was then spun at 5,000 rpm, the cells were collected and frozen at −20° C. until affinity purification was to be performed. Recombinant LLO (AA sequence 20 to 442 of LLO, excluding the signal sequence) was purified from the bacteria soluble protein fraction according to the protocol provided by QIAGEN. Briefly, frozen cells were thawed on ice, incubated in lysis buffer (50 mM phosphate, pH8, 500 mM NaCl, 20 mM imidazole, 10 mM β-mercaptoethanol) supplemented with lysozyme (Calbiochem) and a cocktail of protease inhibitors (Roche) for 30 minutes at 4° C. The cells were then sonicated three times for 10 second bursts each until all bacterial clumps were removed. The lysed bacteria were then spun at 24,000 g and the supernatant removed (soluble protein fraction). The soluble proteins were then loaded onto a pre-equilibrated Ni⁺-NTA agarose (QIAGEN) column; weakly bound proteins were removed by washing until the A₂₈₀=<0.05. At this point, the recombinant LLO was removed from the column by addition of elution buffer containing 500 mM imidazole. Elution fractions were collected and pooled, dialyzed against LLO storage buffer overnight (50 mM phosphate/acetate, pH6, 1M NaCl, 5 mM DTT) at 4° C. and then stored in 1 mg/ml aliquots at −80° C. until needed.

Conjugation of 38C13 Lymphoma Idiotype Protein to Immunogenic Proteins and Validation

38C13 Id protein was conjugated to either Keyhole Limpet Hemocyanin (KLH, Pierce Endogen) or purified recombinant LLO using glutareldehyde to cross-link primary amines on the proteins. Briefly, 1 mg/l Id protein and 1 mg/ml immunogen were combined in a sterile tube with fresh 0.1% glutaraldehyde (SIGMA), the proteins were then mixed on a rotator for 10-15 minutes at room temperature. The conjugated proteins were then dialyzed against 0.1M PBS at 4° C. overnight; the conjugation of Id protein to immunogens was confirmed complete by SDS-PAGE and Coumassie stain. The conjugate proteins were then depleted of endotoxin using Detoxigel (Pierce Endogen), all vaccines had <1EU/μg protein. Protein conjugates containing recombinant LLO were checked for the absence of residual lytic function using sheep red cells as the target as described for detoxLLO.

Example 11 Construction Of the 38C13 BCR-LLO Vaccine

Purification of idiotype proteins. B-cell lymphoma idiotype proteins were purified from hybridoma supernatant via differential ammonium sulfate precipitation. The process for production of the 38C13 lymphoma idiotype protein is outlined in FIG. 14. The 38C13A1.2 hybridoma secreted the IgM protein into the Bioreactor (BD Celline) supernatant. The IgM protein was recovered from the bioreactor supernatant following differential ammonium sulfate precipitation. Samples from each fraction were run by SDS-PAGE under reducing and non-reducing conditions and characterized by Coumassie stain (see FIG. 15). The 45% fraction from the bioreactor supernatant contained the 38C13 IgM protein; recovery was 2 mg/ml supernatant.

Recombinant LLO was recovered from soluble proteins from BL21* following IPTG-induced expression induction for 18 hours at 30° C. The soluble proteins were incubated in batch form with Ni⁺-NTA agarose for 30 minutes at room temperature. Non-specifically bound proteins were removed following a washing step in phosphate buffer, pH 8 containing 20 mM imidazole. The recombinant LLO-His was then eluted from the column using phosphate buffer pH 8 plus 500 mM imidazole. The purity of the elution fractions was confirmed by SDS PAGE followed by Coumassie stain or Western blot using the Mab B3-19. Results show (FIG. 16) that a single band of molecular weight 58 kD was eluted from the Ni⁺-NTA column and its identity as confirmed as LLO by the Mab B3-19.

Subsequently, the 38C13 idiotype protein was conjugated to recombinant LLO or KLH using 0.1% glutaraldehyde for 10 minutes at room temperature. The glutaraldehyde was removed following dialysis against 0.1M PBS at 4° C. overnight. The 38Id-LLO and 38Id-KLH conjugates were then characterized by SDS-PAGE under reducing and non-reducing conditions followed by Coumassie stain (FIG. 17). Results showed the conjugation was successful with no free 38Id protein nor immunogenic protein in either conjugate. To ascertain that the 38C13 idiotype epitope was still present following conjugation, a FACS-based competitive binding assay was developed (FIG. 18). This assay detects the ability of the 38Id conjugate to block the specific binding of FITC conjugated S1C5 Mab to the 38C13 lymphoma BCR. The presence of 100 ng 38Id protein was sufficient to block binding of the 0.1 ug S1C5 Mab to 38C13 lymphoma cells (FIG. 19). In contrast, 1 mcg 38Id-LLO or 10 mcg 38Id-KLH were required to block binding of 0.1 mcg S1C5 Mab to 38C13 lymphoma cells.

Example 12 38C13 BCR-LLO Vaccines are Efficacious in a Mouse Non-Hodgkin's Lymphoma Tumor Protection Model

C3H/HeN mice (n=8) were vaccinated with (a) 38C13 idiotype protein (38-Id), (b) 38Id coupled to Keyhole Limpet Hemocyanin (38Id-KLH); (c) 38Id-LLO; or (d) PBS (negative control). Vaccines were administered as two 50 mcg s.c. doses on days 0 and 14 days, with 10,000 U murine GMCSF (mGM-CSF). In addition, 10,000 U Mgm-CSF was administered on the same flank for 3 consecutive days. On day 28, mice were challenged with 10³ 38C13 lymphoma cells on the flank used for immunization, and tumor formation was monitored for 100 days. The 38Id-LLO vaccine induced tumor protection in 7/8 mice up to 65 days (FIG. 20). Mice vaccinated with 38Id-KLH were shown to have a lower level of resistance to the 38C13 lymphoma (5/8 tumor free at day 65) compared to mice vaccinated with 38Id-LLO (7/8 tumor free), but this did not reach statistical significance (p=0.273). In contrast, mice immunized with 38Id or PBS had poor 38C13 lymphoma resistance, with all mice developing tumors by day 22. When the incidence of tumor formation was examined statistically, the test vaccine group (Id-LLO) was shown to have a significantly lower incidence of tumors versus the 38Id (p=0.0016) or the PBS group (p=0.0001).

Example 13 38ID-LLO Induces High Titer Anti-Idiotype Antibodies After One Immunization with a Strong Ig2A Subtype

Peripheral blood samples were collected from individual mice prior to and 12 days after each immunization. The serum samples were then tested by ELISA assay for the presence of anti-idiotype antibodies. Mice from the 38Id-LLO and 38Id-KLH vaccine groups were the only vaccine groups with sera positive for anti-idiotype antibodies (FIG. 21A). Compared with control vaccine groups, mice immunized with 38Id-LLO had high titer anti-idiotype antibodies following one immunization; whereas mice immunized with 38Id-KLH required two immunizations to achieve the same titer. An isotyping assay was performed to characterize the anti-idiotype antibodies induced by 38Id-LLO versus 38Id-KLH. Following a single immunization with 38Id-LLO, a high titer polyclonal response was induced with equivalent levels of IgG1 and IgG2a anti-idioype antibodies (FIG. 21B). The level of the 38Id-LLO induced antibodies increased after the second immunization; however the ratio of IgG1:IgG2a (1.0) remained the same. In contrast, the 38Id-KLH vaccine induced a higher level of IgG1 versus IgG2a anti-idiotype antibodies after both immunizations (IgG1:IgG2a ratio was 1.8 and 1.3 respectively; FIG. 21B). Levels of IgG2a anti-Id antibodies were statistically different between Id-LLO and Id-KLH sera after the first (p=0.0001) and second (p=0.002) immunizations. The level of IgG1 anti-idiotype antibody was only statistically different between these two vaccine groups after the first immunization (p=0.03). The anti-Id antibody status correlated well with the days to formation of a tumor for each vaccine group. While the naïve and Id alone vaccine groups had all formed tumors by day 18 and were negative for anti-Id antibodies, all Id-LLO and Id-KLH immunized mice developed anti-Id antibodies, and this correlated with tumor resistance, with 7/8 Id-LLO mice and 5/8 Id-KLH mice tumor free 60 days after 38C13 challenge.

To confirm the above results, the ability of immunized mouse serum to block binding of S1C5-FITC to 38C13 cells was measured, as a decrease in fluorescence by FACS. In the first experiment (FIG. 22A), the binding specificity of S1C5 to the 38C13 lymphoma idiotype was verified. Subsequently, the inhibition of S1C5 binding to 38C13 cells by mouse serum (taken at various stages through Id-LLO immunization and after tumor challenges) was investigated (FIG. 22B). In this study, mouse serum inhibited binding of S1C5 to the 38C13 cells after the 1^(st) and 2^(nd) immunizations and after tumor challenges, but not pre-immunization

Example 14 38Id-LLO Immunization Induces a Th1 Response in the DLN

To investigate the CD4⁺ and CD8⁺ T cell responses to the protein vaccines, DLN were harvested 14 days after the immunization protocol. Cytokine secretion was examined by FACS, CD4⁺ T cells from the Id-LLO vaccine group secreted IFN-γ in response to in vitro re-stimulation with LLO protein versus the PBS control (p=0.02, FIG. 23A). In no other vaccine groups did significant numbers of CD4⁺ T cells secrete IFN-γ in response to protein re-stimulation. However, CD4⁺ T cells from the same vaccine groups did not respond significantly to in vitro re-stimulation with 38Id protein.

IL-4 secretion in response to in vitro protein re-stimulation was also examined. In mice immunized with Id-KLH, Id-LLO or LLO alone, CD4⁺ DLN cells responded significantly to in vitro restimulation with the immunogens KLH or LLO (FIG. 23B). The frequency of CD4 T cells (from the Id-LLO vaccine groups) responding to LLO re-stimulation by secreting IL-4 (0.7) % was lower than that observed for CD4 T cells secreting IFN-γ (3.8) %. Simultaneously, DLN CD8 T cell response to protein re-stimulation was examined in immunized mice (FIG. 23C). The level of IFN-γ secretion in response to LLO re-stimulation was 18% in mice immunized with Id-LLO (p=0.0005) significantly higher compared to KLH re-stimulated Id-KLH immunized mice (10%, p=0.009). A significant response to re-stimulation with the idiotype protein was also seen in the DLN CD8 T cells from mice immunized with Id-LLO (p=0.04) and Id-KLH (p=0.02).

Proliferative responses of DLN CD4 T cells to immunization and in vitro re-stimulation were examined by CFSE fluorescence. In each vaccine group, the conA positive control demonstrated the proliferative potential of the cells (FIG. 24). This proliferative response was characterized by 7 cell divisions by a subset of the initial CD4 T cell population. The average number of cell divisions responding CD4 T cells underwent in response to in vitro re-stimulation (proliferative index) ranged from 1.7-3.0 in the presence of conA (FIGS. 23D and 24). There was no proliferation in the 2 control vaccine groups, PBS and 38Id, in the presence or absence of protein re-stimulation (proliferative index of 1.0), while cells from the 38Id-LLO and 38Id-KLH vaccine groups responded to 38Id protein restimulation with a proliferative index of 1.2 in each vaccine group. Also, the Id-LLO vaccine group cells exhibited a marked proliferative capacity in response to LLO re-stimulation (proliferative index of 3.2). The response of cells from the 38Id-KLH group to KLH re-stimulation had a proliferative index of 1.3.

Thus, 38Id-LLO immunization induces a draining lymph node Th1 response.

Example 15 Construction And Testing of mutLLO-38C13 BCR and ctLLO-38C13 BCR Vaccines

mutLLO-38C13 BCR and ctLLO-38C13 BCR vaccines are constructed from mutLLO-, ctLLO-, and 38C13-encoding DNA as described in Example 11. The vaccines are tested as described in Example 12, and are found to exhibit protective anti-lymphoma activity.

Example 16 Construction And Testing of mutLLO-E7 and ctllo-E7 Vaccines

mutLLO-E7 and ctLLO-E7 vaccines are constructed from mutLLO-, ctLLO-, and E7-encoding DNA as described in Example 11. The vaccines are tested as described in Example 12, and exhibit protective anti-tumor activity.

Example 17 The Impact of Immunization with Detox LLO-E7 Compared to Controls on TC-1 Growth Vaccine Preparation

Recombinant E7 and Detox LLO comprising mutations or deletions in CBD were purified on a nickel column and LPS was removed on a Norgen Proteospin column according to the manufacturer's directions. E7 was conjugated chemically to LLO by mixing 2 mg of Detox LLO with 500 μg of E7 and adding paraformaldehyde to a final concentration of 1%. The mixture was shaken on a rotator for 40 minutes at room temperature and then dialysed at 4° C. overnight in PBS.

Tumor Regression

1×10⁵ TC-1 were established on the flank of each mouse, and on days 3 and 10, mice were immunized subcutaneously along the back with 250 μl of PBS containing E7 50 μg, Detox LLO 200 μg mixed with 50 μg of E7, DetoxLLO-E7 conjugate 250 μg or PBS only (naïve).

The Impact of Immunization with Detox LLO Chemically Conjugated to E7 and Detox LLO+E7 on Tc-1 Growth

Mice were immunized subcutaneously along the back with 250 μl of PBS containing: E7 (50 ug), DetoxLLO (200 μg) mixed with E7 (50 μg), DetoxLLO-E7 conjugate (250 μg), or PBS only (naïve).

Mice administered conjugated LLO-E7 demonstrated an attenuated increase of tumor size compared to naïve controls. Mice administered LLO+E7 mixed also demonstrated an attenuated increase in tumor size (FIG. 27). While all naïve animals had tumors by day 7, 2/8 mice were tumor free following administration of DetoxLLO-E7 conjugate and 4/8 mice were tumor free following administration of DetoxLLO mixed with E7 on day 49 (FIG. 27, Table 3).

The Impact of Immunization with E7 or LLO Protein on TC-1 Growth

Mice were immunized subcutaneously along the back with 250 μl of PBS containing: E7 (50 μg), LLO (250 μg) or PBS only (naïve).

Tumor regression was not noted in mice that were immunized with either LLO or E7 alone where in each respective case, 0/8 and 1/8 mice were tumor free on day 45, Immunization with LLO, and to a greater extent with E7 delayed the time to tumor onset (FIG. 28). However, by day 45, only 0/8 and 1/8 mice were tumor free from the LLO and E7 groups, respectively.

The Impact of Immunization with DtLLO Genetically Fused to the Whole E7 Sequence and LLO Detoxified by Replacing the Cholesterol Binding Region with the E7 Epitope on TC-1 Growth

Mice were immunized subcutaneously along the back with 250 μl of PBS containing: recombinant DTLLO-E7 whole (whole E7 sequence genetically fused to DTLLO; 250 μg), DTLLO-E7 chimera (LLO detoxified by substitution of CBD with E7 epitope; 250 μg) or PBS only (naïve).

DTLLO-E7 whole and DTLLO-E7 chimera delayed the appearance of tumors compared to naïve controls (FIG. 29). DTLLO-E7 chimera demonstrated a stronger inhibition of tumor growth (8/8 tumor free at day 49 post-tumor inoculation) compared to DTLLO-E7 whole (5/8 tumor free at day 49 post tumor inoculation; FIG. 29 and Table 3). Comparable results were obtained in repeated experiments (FIGS. 30-32).

Example 18 TC-1 Tumor Regression after Immunization with Acta, E7, or Acta+E7 Mixed or Genetically Fused Acta-E7

Vaccine Preparation

Recombinant E7 and Recombinant ActA or ActA-E7 fusion protein were purified on a nickel column and LPS was removed on a Norgen Proteospin column according to the manufacturer's directions.

Tumor Regression

1×10⁵ TC-1 were established on the flank of each mouse, and on days 6 and 13, the mice were immunized subcutaneously along the back with 2500 of PBS containing E7 (50 μg), ActA (200 μg) mixed with E7 (50 μg), genetically fused ActA-E7 (250 μg), or PBS only (naïve).

Results

Mice immunized with ActA alone, E7 alone, ActA-E7, or ActA+E7 demonstrated an increased latency to onset of tumors compared to controls (FIGS. 33-35). Mice immunized with ActA-E7 (genetically fused) demonstrated strong tumor regression, with 7/8 mice tumor free on day 55 following immunization (FIG. 33, Table 3). Mice immunized with ActA+E7 demonstrated superior tumor regression compared to E7 and naïve controls, with 7/8 mice tumor free on day 55 following tumor inoculation (FIG. 34, Table 3). Mice immunized with ActA alone demonstrated superior tumor regression compared to mice immunized with E7 or PBS-injected controls (3/8 mice tumor free following immunization compared to none of the mice in the E7 or naïve groups; FIG. 35, Table 3).

TABLE 3 Summary of rates of tumor-free mice: Examples 17-18 # mice Vaccine FIGURE tumor free Comments LLO-E7 27 4/8 Chemically conjugated LLO + E7 27 2/8 Mixed E7 28 1/8 LLO 28 0/8 LLO-E7 29 5/8 Genetically fused LLO-E7- 29 7/8 Genetically replaced chimera E7 30 0/8 LLO 30 0/8 LLO-E7 30 6/8 Genetically fused LLO + E7 30 2/8 Mixed LLO-E7- 31 8/8 Genetically replaced chimera E7 32 0/8 Day 33 LLO 32 0/8 Day 33 LLO-E7 32 8/8 Day 33 LLO + E7 32 6/8 Day 33 LLO-E7- 32 8/8 Day 33 chimera ActA-E7 7 7/8 Old expression system ActA + E7 7 4/8 E7 7 0/8 ActA 7 3/8

Example 19 DetoxLLO Induces Cytokine mRNA Expression and Cytokine Secretion by Bone Marrow (BM) Macrophages

8e5 Day 7 BMDCs were thawed overnight at 37° C. in RF10 media. Next, BMDCs were centrifugated and resuspended in 1 mL of fresh RF10 at 37° C. for 1 hr. BMDCs were treated w/40 mcg/mL of LLOE7 and molar equivalents of E7 and LLO (or with PBS as negative control or 1 mcg/mL LPS as positive control). After 2 and 24 hrs, cells were collected by centrifugation and media saved for ELISA and analyzed for cytokine secretion. RNA was extracted from cells and converted to cDNA. cDNA was then subjected to qPCR analysis with primers for various cytokines, and cytokine mRNA expression levels were assessed.

Results

DetoxLLO, administered alone, with E7, or fused to E7, induced TNF-α (FIGS. 37A-B), IL-12 (FIGS. 37C-D), and ISG15 (FIG. 37E) mRNA expression by BM Macrophages after 2 (FIGS. 37A and 37C) and 24 hours (FIGS. 37B, 37D, and 37E) compared to controls. Similarly, detoxLLO induced secretion of TNF-α (FIG. 38A) and IL-12 (FIG. 38B) by BM Macrophages after 2 and 24 hours.

Example 20 Detox LLO Upregulates Dendritic Cell Maturation Markers

Bone marrow was collected from the femurs of C57BL/6 mice at 6-8 wk of age. Bone marrow cells from four mice were pooled, and cells were cultured in RPMI 1640 medium containing 10% FCS and 100 U/ml penicillin/streptomycin in 100×15-mm petri dishes. After 2-h incubation at 37° C. in 10% CO₂, nonadherent cells were removed by washing with warm medium. The remaining adherent cells were collected by scraping with a sterile cell scraper. After washing, the cells were adjusted to 0.5×10^6/ml, and were placed in a 24-well plate with 20 ng/ml recombinant murine GM-CSF (R&D Systems, Minneapolis, Minn.). The medium was changed every 2-3 days. After 7 days of culture, nonadherent cells were collected, washed, and used in the experiments.

These bone marrow derived dendritic cells (day 7) were plated at 2×10^6/ml and then pulsed with either E7 (10 mcg/ml), LLO (40 mcg/ml), or LLOE7 (50 mcg/ml) plus LLO (40 mcg/ml) for 16 hr in 37° C., 5% CO₂. The phenotype of the DCs obtained using this protocol were analyzed by FACS analysis. DCs were harvested after 16 h as described above. Cells were stained with APC-labeled mAbs specific for mouse CD11c, or FITC-labeled mAb specific for mouse CD86, MHC class II, CD40. Isotype-matched mouse IgG was used as a negative control and subtracted from the background. Cells were incubated with mAbs for 30 min at 4° C. in the dark. Following two washes with PBS, 10 μl of 7AAD (Beckman Coulter, Marseille, France) was added 10 min before cells were analyzed on a FACS flow cytometer.

Results

Administration of detoxLLO (in the LLO, LLO+E7 and LLOE7 groups) upregulated CD86, CD40, and MHCII (FIG. 39) compared to controls.

Example 21 Regression of TC-1 Tumors by LLO-Fused E7

2×10^5 TC-1 tumor cells were established s.c in 8 mice per vaccine group. Mice were immunized s.c. with 50 μg of E7, 200 μg of LLO, 250 μg of LLOE7, or 50 μg of E7 plus 200 μg of LLO on Days 3 and 10.

Results

Mice administered conjugated LLO-E7 demonstrated an attenuated increase of tumor size compared to naïve controls. Mice administered LLO alone or LLO+E7 mixed also demonstrated an attenuated increase in tumor size (FIG. 40). While all naïve animals had tumors by day 75, 5/8 mice treated with LLO+E7 and 7/8 mice treated with LLOE7 were tumor free on day 75 (FIG. 40).

Example 22 Nuclear Translocation of NF-Kappa-B after Stimulation with Dt.LLO

J774 macrophage cell line used as model system for antigen presenting cells (APCs). 5×10^ 5 cells per well (6 well dish) were plated in a total volume 1 ml. Cells were stained with anti-NF-κB (P65)-FITC (green fluorescence) and DAPI for nucleus (blue fluorescence). In FIGS. 41B, D, and F, cells were also stained after 24 hours with anti-CD11B-PE (M1/170, eBioscence), which is expressed on the cell surface of macrophage cells and is involved in adhesive cell interactions.

Results

NF-kappaB is located in the cytoplasm after treatment of cells with media alone (no activation) (FIG. 41A). Media-treated cells demonstrate weak Cd11b staining (FIG. 41B). After overnight (24 hr) stimulation with Dt.LLO (30 mcg), NFkappaB moved out of the cytoplasm into the nucleus (FIG. 41C) and there was an increase in CD11b staining (FIG. 41D). Similarly, after overnight stimulation (24 hr) with LPS (10 mcg/ml, positive control), NFkappaB was translocated to the nucleus (FIG. 41E), which is emphasized by the increased CD11b+ staining of the plasma membrane (FIG. 41F).

Thus, in one embodiment, the data demonstrate the ability of detox LLO to stimulate innate immunity via macrophages and DCs.

While certain features of the invention have been illustrated and described herein, many modifications, substitutions, changes, and equivalents will now occur to those of ordinary skill in the art. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the invention. 

What is claimed is:
 1. A recombinant Listeria expressing a recombinant protein, said recombinant protein comprising a listeriolysin 0 (LLO) protein comprising a mutation of amino acid residues on positions 2, 9 and 10 in the cholesterol-binding domain (CBD) of said LLO protein, and wherein said CBD is set forth in SEQ ID NO:
 18. 2. The recombinant Listeria of claim 1, wherein said amino acid residues on positions 2, 9 and 10 of SEQ ID NO: 18 correspond to C484, W491 and W492 of an LLO protein, and wherein said LLO protein is set forth in SEQ ID NO:
 37. 3. The recombinant Listeria of claim 1, wherein said LLO protein comprises a deletion of the signal peptide sequence thereof.
 4. The recombinant Listeria of claim 1, wherein said LLO protein comprises the signal peptide sequence thereof.
 5. The recombinant Listeria of claim 1, wherein said recombinant protein further comprises a heterologous peptide of interest.
 6. The recombinant Listeria of claim 5, wherein said heterologous peptide of interest is an antigenic peptide.
 7. The recombinant Listeria of claim 6, wherein said antigenic peptide is a B-cell receptor (BCR) peptide.
 8. The recombinant Listeria of claim 6, wherein said antigenic peptide is a Human Papilloma Virus (HPV)-16-E6, HPV-16-E7, HPV-18-E6, HPV-18-E7, a Her/2-neu antigen, a Prostate Specific Antigen (PSA), Prostate Stem Cell Antigen (PSCA), a Stratum Corneum Chymotryptic Enzyme (SCCE) antigen, Wilms tumor antigen 1 (WT-1), human telomerase reverse transcriptase (hTERT), Proteinase 3, Tyrosinase Related Protein 2 (TRP2), High Molecular Weight Melanoma Associated Antigen (HMW-MAA), synovial sarcoma, X (SSX)-2, carcinoembryonic antigen (CEA), MAGE-A, interleukin-13 Receptor alpha (IL13-R alpha), Carbonic anhydrase IX (CAIX), survivin, GP100, or Testisin.
 9. An immunogenic composition comprising the recombinant Listeria of claim 5 and an adjuvant.
 10. The immunogenic composition of claim 9, wherein said adjuvant comprises a granulocyte/macrophage colony-stimulating factor (GM-CSF) protein, a nucleotide molecule encoding a GM-CSF protein, saponin QS21, monophosphoryl lipid A, or an unmethylated CpG-containing oligonucleotide.
 11. The recombinant Listeria of claim 1, wherein said mutation is a deletion mutation, a point mutation or a substitution mutation.
 12. The recombinant Listeria of claim 1, wherein said recombinant protein exhibits a greater than 100-fold reduction in hemolytic activity relative to wild-type LLO.
 13. A method for inducing an immune response in a subject, comprising administering to said subject the recombinant Listeria of claim 5, thereby inducing an immune response against said antigenic peptide.
 14. A method for inducing an immune response in a subject, comprising administering to said subject the immunogenic composition of claim 9, thereby inducing an immune response against said heterologous peptide of interest.
 15. A method for inducing an immune response in a subject against a B-cell receptor (BCR)-expressing lymphoma, the method comprising the step of administering to said subject the recombinant Listeria of claim 7, thereby inducing an immune response against a BCR-expressing lymphoma.
 16. A method for inducing an immune response in a subject against a HPV-E7-expressing tumor, the method comprising the step of administering to said subject the recombinant Listeria of claim
 9. 17. The method of claim 16, wherein said HPV-E7-expressing tumor is cervical cancer or head-and-neck cancer.
 18. A method for treating, inhibiting or suppressing a HPV-E7-expressing tumor, the method comprising the step of administering to said subject the recombinant Listeria of claim
 9. 19. The method of claim 18, wherein said HPV-E7-expressing tumor is cervical cancer or head-and-neck cancer. 